Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e866d7bd4440685…

MALICIOUS

PDF

79.3 KB Created: 2021-05-29 14:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fef78a09e3c6f32d458edbfc3d4f57e SHA-1: 13ce81c08287a39fa1d1f58d4ff86c55b894c52c SHA-256: 7e866d7bd44406854847d60f5f7fa2cd26b0f9f97c4e65134ff7b5f3fac7c467
186 Risk Score

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://xajibur.ru/strik?utm_term=baby+girl+growth+chart+weight+lbs PDF link annotation
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/c2b0a5af3bb312e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_604316f578d4a.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/9e2bed1f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_60522894baf98.pdfIn PDF document text
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/5814723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_606e0d0cb6a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_601342af1ef53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fcbb933befb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fd0762d34c57.pdfIn PDF document text
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/8259139.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/suxotepogid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ffef0389bfbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fcf9a2470dcf.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/0842497d-3a0e-4915-ab77-3908fa42607d/digital_marketing_classes_miami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f5cf26-54b7-4169-b057-0c6fcb93e334/java_8_jdk_ubuntu_20.04.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f877ef29-6722-4b10-b885-4561a73f7110/how_long_to_steam_eggs_in_hamilton_beach_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28485565-1ae4-4a9e-b68d-068c73ece08b/93983782536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bce2a5-0e90-40db-a560-ffceaff561f7/hoover_steamvac_deluxe_se_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905fb050-6f0c-4011-bb7c-7243d9e8917c/how_to_use_elite_egg_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8b224f-cbb3-47ad-9aca-3bf73cf8a9b5/google_earth_pro_maps_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94734bfa-94ae-46f5-90bb-158c920728ac/4566854517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8071be7a-6651-44e7-bd4c-642870cc4f10/gukilopuzufifodeburuguka.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_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 5444 bytes
SHA-256: fd414c3096fe6015731e3f3da0428a9403d540b45f6ce947bde1aee077382938
font_01_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 10356 bytes
SHA-256: 5cbff20a42da832cb0c16b70ffb5164711b99c243521197221d420d6a1f6261a