Malicious PDF — malware analysis report

Static analysis result for SHA-256 d912e7b5adc7d832…

MALICIOUS

PDF

83.0 KB Created: 2021-04-29 00:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c97f09d5b3290c8ec45e919a5507776f SHA-1: 78bed6aa09d950c3a4ac6a47a99a4eb4b8d8fe40 SHA-256: d912e7b5adc7d83291cac572742c057ba9a8be54d6c37da573890c5aac229bf4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=the+art+of+french+kissing+pdf PDF link annotation
    • http://janafan.scienceontheweb.net/63028602232.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/suvilufo882x4.pdfIn PDF document text
    • http://sosaroxadexukex.iblogger.org/tosabukezumofafavavekaf.pdfIn PDF document text
    • http://govejulij.22web.org/sepsis_guideline_2016_sofa.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/P9UBVhb/50924396320.pdfIn PDF document text
    • http://dress-russia.ru/579025454035zorz.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/dhahihh/jajagetowodubadunumawu.pdfIn PDF document text
    • http://toportt.online/gubadilm7f3u.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/erjctii/what_animal_are_you_quiz_buzzfeed.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/7LzhbXL/98705981458.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/RCjhig8/brain_it_on_physics_puzzles_online.pdfIn PDF document text
    • http://nolonumufowarob.iblogger.org/fundamentals_of_engineering_economics_2nd_edition_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0d221cedc8be4b0eac65697d30b3c75b.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d5da3ce4fd774904ba508d427cf22a4c.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_53238b180429439ebb3d82b51c495e8d.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_98540dae81704dbda7013a2131353505.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_e7aefeb862b84b99b826964382bfc48a.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_025ef1a52a7b4ce3b217e3c589099143.pdf?index=trueIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_30c6657b606243aea9b30cf69ed56c3b.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_097e74d8aa4e4e50a5c00a1a13225bca.pdf?index=trueIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_9f5689a4c72845abb8068a0377fe295e.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4133892e95c7493f8f1685ec07fbf749.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.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5400 bytes
SHA-256: 02ec3260c7b5a2ddf6b1a6d2b5dab4fe8c7c73e0acf74caa79223b7e4d1af63e
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 10844 bytes
SHA-256: 1c5757ba6dad33c94af4c8603f7a5e81fd64ca863d4d8fe208cb3f83c26a2c3f

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