Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5d15987db267eb…

MALICIOUS

PDF

84.1 KB Created: 2021-03-07 14:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1e7fa414c5b2fe4dce3d9c7c84bfd49e SHA-1: 5874f4bc86777bc20900518bbd7e47520959fda0 SHA-256: 9d5d15987db267ebf84472d8938a7702e2c5182d343f2ab7212f51ca91e2a544
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve as the initial lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=what+size+light+bulb+for+oven PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409621/normal_60323d2676fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_5fe530d5b1a01.pdfIn PDF document text
    • https://xemamipu.weebly.com/uploads/1/3/0/8/130813095/kafogafapogeval.pdfIn PDF document text
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/gobibiboxif_jusuguz_pikuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5feaef7205eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5ff09ad57497e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5fc702663c426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_602abc7ddc77b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_600f7a5d691de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412768/normal_5ff8c3e5d44ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_603a1b5194a94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_c12c18eef02e454eb09c7091bc3edb95.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_5ab99ccad9fd4371bf7800313fd57780.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_1922a50f966e442a93f06ab136f1b16e.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_1532d334269b41ae996621709e43d210.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_b3057f7718514c0e8667a518e27c871a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2faf1e5-82eb-4f9d-981e-7faac7c09daf/do_you_have_to_read_diary_of_a_wimpy_kid_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c78b3b-344d-4fe7-b321-ca700df90fc3/whats_healthy_at_taco_bell.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_9ecda50086d043e58ce71a2e7f613668.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c230804-2753-4cde-8531-5b425a09c374/2049648165.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_34b668e1a9094de8b568627cf481932a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 5292 bytes
SHA-256: 2d26564febbb2fdc7c073a4e68c0080be2d7e78b8ab6d9ee2187ce998f11a4b0
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10768 bytes
SHA-256: fceca69730cde46bc2e2915fea1ccde665af46161034112fe7201776a37d9be7