Malicious PDF — malware analysis report

Static analysis result for SHA-256 9348f63bebd14c51…

MALICIOUS

PDF

99.2 KB Created: 2021-05-15 22:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 79a5972ec494474858617e75b662946f SHA-1: c83f5018ca0a325bdf8c1f72a41120c7af816246 SHA-256: 9348f63bebd14c51056915fbb6bf88fc20db3b6e18e56432c230d35c1223a821
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://botokaw.ru/strik?utm_term=how+to+check+zener+diode+in+hindi', likely serve as lures to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=how+to+check+zener+diode+in+hindi PDF link annotation
    • https://getezulesu.weebly.com/uploads/1/3/1/0/131071231/dajetewuferubigib.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/3e10e63da35a.pdfIn PDF document text
    • https://bifepafu.weebly.com/uploads/1/3/5/3/135315465/d0955ab.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/carpentry_and_joinery_level_1_book.pdfIn PDF document text
    • https://fekujerixotose.weebly.com/uploads/1/3/4/8/134896765/2769bc62.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/skf_bearing_numbering_system.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/difafukodadoxuwavu.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/nanostructures_and_nanomaterials_synthesis_properties_and_applications.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/4d835d.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/86322432812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_256bce89a25d4817900e4faecdde9a9d.pdf?index=trueIn PDF document text
    • http://pazepoxi.atwebpages.com/batarowegulona.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_5871622963ff43b49655db4bf66b994d.pdf?index=trueIn PDF document text
    • http://bujekotu.atwebpages.com/25236432925.pdfIn PDF document text
    • http://mepitar.atwebpages.com/24794583923.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_4d15a28d8815451b846cdd48f7103668.pdf?index=trueIn PDF document text
    • http://galefawanakujum.rf.gd/to_whomsoever_it_may_concern_letter_template.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_7a7c862c1fd5488eac3a2a60cc4d2428.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_163031c18df54e638a5ba89a0bbf4a98.pdf?index=trueIn PDF document text
    • http://sibazod.epizy.com/adenomas_hipofisiarios_revision.pdfIn PDF document text
    • http://vipezirovopegem.epizy.com/lenorasilos.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_766ca0eac1554d1481cfde49972afd9c.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_4bfd2297d896457d9a65f621f0b7f4ca.pdf?index=trueIn PDF document text
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_2f0df260dbe3463aa8e55ef4ee8a6e7b.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_2f83ede91e384588aec25953391af1c6.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_639db6c8e5654ef3abb080fcc5007a52.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 4560 bytes
SHA-256: 826f65312aac47881b800b7a0d907f37de99d9760ea5de5bd1e1ef8ce0c43747
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 10896 bytes
SHA-256: ac432dd60d6ddbcdfffaabb255609b0653e0474b1e5114d8bf23fb6bf7423cca
font_03_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off0001501f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501F 15404 bytes
SHA-256: 15d9b8da7829a0138539c360123eb8b97407238d0808da37c4de626e1ced2856