Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa6b60d3f7dc4ab…

MALICIOUS

PDF

77.4 KB Created: 2021-03-07 04:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 35fb15db914ac9ba439dbf2859932f97 SHA-1: 68bfc4779ef4437a63f423a68ce8f2f97996b8c2 SHA-256: efa6b60d3f7dc4ab7ccad0aa06680e541e0367702ce15796cceb68bfd13c2af1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

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://jottigo.ru/strik?utm_term=english+102+vs+103 PDF link annotation
    • http://heleogose.online/luxatu6pti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fdbc706c376c.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/bowovel.pdfIn PDF document text
    • http://copyrightviolationcenters.com/peak_book_reviewy645x.pdfIn PDF document text
    • http://goossyy.online/75032497399mf8b.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/7667121.pdfIn PDF document text
    • http://carinsusa.info/73404081025v3bzh.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/swf_embroidery_machine_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ff0179b4e28d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6035f2e1ebcf1.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/raxejo.pdfIn PDF document text
    • http://segwaywheelchair.ru/sivososopatowudelufadimemuyb0a.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/7008302.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/what_is_a_3_phase_isolation_transformer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b479a3d3-31ac-41af-a7ac-60e8100862ae/marshall_dsl40c_with_creamback_review.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_44f0ddc882bf4502a6d920db2a0a095c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d822bce-3993-4a7f-a6ab-7cb2400cc45f/how_much_is_a_2015_jeep_wrangler_sport.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_b8d3f123dabc4a43b855fea0dead6e39.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_38e2a778cb464f089c7316d421c1e792.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a9a81b-25c2-432d-86e2-ab5f57dfb128/puvimagolulobaf.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_dd416b088e1b46a2b9be1bf562bc1745.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4083ab-e3eb-4451-be1b-779bb8783bc2/what_is_magna_carta_in_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd37ec1-6d82-47cc-af7c-35fea694abf9/what_foods_detox_the_liver.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5148 bytes
SHA-256: cddd01e87472f535ea2c71955f9ae07b533fc43ea67d38ea16698291ef8f94c5
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 10620 bytes
SHA-256: b9068742070219bcaadda066dcc3b29fcb7571fd118869004c08853c4dd5ca49