Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26dfb0bc177813…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 23:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 549e942a97d9b557dd6202e9bda7d250 SHA-1: 065480862e337d22935e7ddc2e04da05876e5484 SHA-256: 7f26dfb0bc177813e18b8207e6e80d98c6fb73b1ce73422a78e83978a3f63104
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one that appears to be a search query for an accident report form. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful content, possibly for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=wsp+state+accident+report+form PDF link annotation
    • http://zisapawiwako.mypressonline.com/belotadakojekomi.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/kezejuzi.pdfIn PDF document text
    • https://xusozetogiza.weebly.com/uploads/1/3/4/6/134620001/kigalari_tepox_jibam_savevuxa.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/89e6211da6708.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/25019116424.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/39791302721.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/8412705.pdfIn PDF document text
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/jozazowawuj.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/9c8f8f38-3c10-44f6-9c4c-b355f666ea4d/29290901555.pdfIn PDF document text
    • https://c0add167-8731-41f0-9a7b-3d62f09b0499.filesusr.com/ugd/879476_46e467ebe3d24c3fbb396346ca5b1ddc.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_710644bea07f41b5868eb8d6b90b913c.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_929b93d2c8794deaaaf8dda641726b15.pdf?index=trueIn PDF document text
    • http://pulutugorivexek.atwebpages.com/nic_neoplasia_intraepitelial_cervical.pdfIn PDF document text
    • http://maludoxowo.rf.gd/nefezivisizigek.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_9aa6dfb3efc74e2f91056a4cba870eb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25e5164-cbd4-439d-a3c8-4287163974fb/julius_caesar_book_summary.pdfIn PDF document text
    • http://faminosokaru.epizy.com/biotin_bula.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_36b199804de147b3af2b195c8a82e8c4.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_f3ff8d3ce71f445a8362e175c3fa7125.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed50eb48-2449-4aa8-aa10-5d34b78f0405/lee_strobel_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680116d5-a434-4d89-b725-fc91f5bd8e30/nudutamovoxeduxadurodir.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_5e651335e2db4b4fa4a906d9718b9787.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_cb01b98f2ddd423481399313ea31f18a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ba76b2-7db8-4e39-be8d-e1f06d18830b/5284751472.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_3afe7454484248cca9e09b009d2a4cea.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_724b91867b614bac9be66c311bf74270.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5284 bytes
SHA-256: e93cfc7d5d65e1d84bb6b6aa36f508b23671e8b04355c26c6d5e6814237fe4cc
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 10668 bytes
SHA-256: 8817d25d16ca10c613b68d4245b3e8cefcc24d173775083640fc85d10d9e0f05

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