Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f58f072ffb7effd…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 15:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9a5a8ac89cc6ff053ecfd10c000a283 SHA-1: 3d5ee0b00195f6dacfc1fa6bcb821267b2d8c20e SHA-256: 6f58f072ffb7effd1c9ce996c7540aaf6de799bedd967ad961a17bdb0d540574
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://jumiwimov.ru/wix?keyword=chapter+8+money+in+review+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6032cd0348ae4.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/sEjdyjg/73537764316.pdfIn PDF document text
    • https://cdn.sqhk.co/rusefijow/ahhFifu/combat_quest_archer_action_rpg_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/sibonawumup/Ahaznjb/72887743418.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jiNCMUT/wiketude.pdfIn PDF document text
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/2866468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_602892159f5f7.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jhMhfww/permutations_combinations_and_probability_worksheet.pdfIn PDF document text
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/teramuleza-sejideroliba.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/ew5giR1/prison_architect_mobile_wiki.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/f236eb1.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/hJggnje/asme_b31._3_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_601535d9154de.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/Ciiic5j/54389325222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_60594c182d451.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/jjehi6T/20444568853.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/VjfLQpf/linear_equation_formula_calculator.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/2850bdac-359c-46ed-b4c2-7a9d65120f4a/how_to_wash_alpha_omega_elite_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9f720e-7356-488d-83de-e5bf466d6629/gogalolutopimo.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5380 bytes
SHA-256: 3766cc46ab1709f2d1db9c477f9817970fee18e982143e2f59fb447dc841ece1
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10620 bytes
SHA-256: 878c327d5252b005cf945e4cf153ecb9f6c33bb4b9543a2cd39a265c4efe9f09

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