Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca26b9e346e613b…

MALICIOUS

PDF

88.8 KB Created: 2021-04-06 12:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e398de0931f9e94a618a9241b1f5621 SHA-1: da4ad3641fd33b4b1fc0f9cb6fce0ea6b711f957 SHA-256: 1ca26b9e346e613b94fff5bbb2850a7c212b7c62434a8c2791f4527c40fff3ad
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=traffic+rider+cheat+your+way PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415525/normal_605716a683458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_6051a68b764ae.pdfIn PDF document text
    • http://cmb-societe.com/which_one_is_best_app_for_english_speakingwdmgs.pdfIn PDF document text
    • http://duplicwcnj.space/62616241056s0xj0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_60032953a2357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_5fe7dd798a71c.pdfIn PDF document text
    • http://yandex-delivery.cc/how_to_get_radius_of_cylinder_from_volumeb3dpe.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/f128adde-27a6-437b-8c24-897fdc132441/76180796674.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/coquette_regular_font_free.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_e634a25578a74782a96b0dcc7f01af16.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_2f55b93000b24db78a14609eecfd8621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2667a-2bbc-40be-85df-f64eb73602a5/32513868111.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_6c014fc26c2d4f059dca56b444c9fe44.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_38633d1404704224b9482886dae4e98a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/rogopuwiwu.pdfIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_37fc6de68c50434eaf532cde53cfd9e5.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_3afa1a6c9eaf42179e0507a402a1f1aa.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_b9910c21ceaa45dc830c0c65b4a359a9.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_bcf73047f00f449ab3586cb8d743216f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/gogalim.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_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 5044 bytes
SHA-256: a0467f6823462ed48131e800e670851f8cfdc97c9a80190ffd6ac4ad5eda7e42
font_01_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 18012 bytes
SHA-256: 42e810b7564fe384916dabbd06fa987d8f578a66dced38e925ebded2fb9a3b02