Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f002f227d50ec4e…

MALICIOUS

PDF

81.5 KB Created: 2021-05-29 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b1215a336207c8f4b3ab16787705e237 SHA-1: 0269a58f11b57f8ac2fe844fd7b79a312f7fcfe3 SHA-256: 0f002f227d50ec4e8fd40835ea405e90e871a7df1342a45a6891596252228a07
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=habitat+and+ecological+niche+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417648/normal_60333f9a2417f.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/980d04169e5125b.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/wizafefuxulazofak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_60302be315ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_60220911011aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469386/normal_6007ba42bf412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_60491daf01107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fe023a8908d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ff71813ca3af.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/c214e.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/7005549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6018d935396f4.pdfIn PDF document text
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/1802416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6028374a49eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_603366dd67447.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/05a8be8b-6c53-4dcc-8f8a-caf7d1017e5f/canon_powershot_s2_is_black_screen_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84369aad-8f6f-4d6e-a794-5d68dc516742/voxupinetalogoberup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70de36bd-0356-4b01-a492-8f14bbda9349/kemixawin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efbdd59-03b9-4948-83bf-e6b7a95fd28a/the_dock_is_connected_j3_problem.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_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 5244 bytes
SHA-256: b08f8aa7f25a8abc7859e3e87fd090e525132a2de6adcd322ab628cf956748d8
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10584 bytes
SHA-256: fbc04af0e3c3c24c0390a052df857c1d09be2b1df610bf4eb8efcae50b05cc5f

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