Malicious PDF — malware analysis report

Static analysis result for SHA-256 371f148c9d27b4f8…

MALICIOUS

PDF

74.9 KB Created: 2021-03-18 20:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83556cfd5e79fa1e10f3e4e53a832f1a SHA-1: d7f4266902a7d53348212cf92bf47c47b6dd4d31 SHA-256: 371f148c9d27b4f89e991336257c69feba82e804da937e3c3b0124d02178fa53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dcuo+feat+guide PDF link annotation
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/1021115.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/vN39Kjb/tubalitogaxotafesib.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/5449068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fff52d72e572.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/kixinorewup_zefebeven_livipax.pdfIn PDF document text
    • http://help-ruleviolation.com/aspiracin_de_secrecionesmn4r0.pdfIn PDF document text
    • http://shopsmmv.site/woolybooger_natural_selection_lab_answers5zz8k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5ffda4fb6c853.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/siforatirop_robibemekivor.pdfIn PDF document text
    • http://lojasamericanasbr.com/90907788201iagz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5fe473a6ce887.pdfIn PDF document text
    • http://feedbacrnz.space/oracle_database_sql_reference_12cx1di5.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/dhbhhgc/31242643502.pdfIn PDF document text
    • https://cdn.sqhk.co/tigadikem/ehdjVUI/44799918340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_4f1efd8814c04e96a41525fe42067729.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e66d3a-8207-4663-8d98-9a109826cb16/preposition_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e2512f-daa0-4028-aa83-9d58dd2a6640/the_woman_who_fell_from_the_sky_review.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_d164e728fb57409c99bca9fa046d72aa.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_81251d2f0f534bfda2f84400fc7fe600.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_e2cd5fcfd84243dfb5f54d4072637b55.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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 4880 bytes
SHA-256: ab32f9df472d2a1744f053d2254523905c09dfa7e5b5517c034d1837a3241062
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11024 bytes
SHA-256: 1e61c91268278bce6c5de60a01807883c02f662d507871e688b35a07a0c758ce

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