Malicious PDF — malware analysis report

Static analysis result for SHA-256 785a6d557aae01b2…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 21:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f8f599c39c4245377d3c6e91400fcdc6 SHA-1: d46565518bf802235cec3db7c246d1ae51afd707 SHA-256: 785a6d557aae01b202265ccf96573989c4c0c5c99f84e06413c9f682e7d31b40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with a 'utm_term' parameter suggest a phishing lure related to essay citation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=how+do+you+cite+a+person+in+an+essay PDF link annotation
    • http://bonifacy.site/kfc_allergen_guide_ukxi08u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6021cc3cd0fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fd36c5916d79.pdfIn PDF document text
    • http://vir-tus.com/893940257410r3jw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5feed29405d3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5fefbfefbc17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_6048a9c46dae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_6039bd3a82619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_603d034760219.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxudodasak.rf.gd/bartender_software_manual.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_692f3cdf837442d4ba0a3757f89eab4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1862d403-2de0-415e-b7c5-013211d9e652/63113047712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a656c3a0-d4f4-4e38-bc8a-8c2cabe2ba4e/how_to_make_alcohol_using_distillation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2fe0c4-dca4-4e69-98fe-3ab93bdc9fd5/nexus_1000ve_installation_guide.pdfIn PDF document text
    • http://sifuzetijo.rf.gd/27854783087.pdfIn PDF document text
    • http://fotiworoz.epizy.com/sevar.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_931d8414398c49eca0fa13928672496b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f5e941-81df-401a-8ba5-20bf92dec90a/26838265689.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_7c54a3a5d28640dfb2787eae4aba3fdd.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_98fcbe93af1245e1a6184d54645f7962.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_b8abfd9ebf3749109aa728acf596ef2b.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 5192 bytes
SHA-256: 9d10e42f2cc84b6287b55ec483013a913da51f5d58dc95a511e91b0e27a8cf82
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10300 bytes
SHA-256: 1df74c5dbf4ba436fe5799d14f2da088f02e68eb2db2a6e99ef05decf1ee2c40

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