Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c102497cac8f4f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 23:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46e2eb9a81a0185aee8a97e67f82ca0d SHA-1: 2b1552e8db37c6c891c155f7919306f91ce78d7a SHA-256: 93c102497cac8f4f9998a303e2a6002c3bd66304706cdb7b94f1e5ed70696f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm. It contains a large number of external links, many pointing to other PDF documents, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The primary IOCs are the numerous external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/aws?utm_term=construction+lingo+for+dummies
    • https://cdn-cms.f-static.net/uploads/4402721/normal_603312daea160.pdf
    • https://cdn-cms.f-static.net/uploads/4495399/normal_5fdbbe82c9c66.pdf
    • https://cdn.sqhk.co/mugejufunij/5nAmkha/phantom_bomber_b17.pdf
    • https://cdn.sqhk.co/rufebumu/vcwgg8H/disneyland_resort_express_route_map.pdf
    • http://koponegigat.medianewsonline.com/what_are_the_highest_paying_jobs_in_information_technology.pdf
    • https://mafivuvaga.weebly.com/uploads/1/3/5/3/135323118/6afe626.pdf
    • http://xafomona.mypressonline.com/genetics_multiple_choice_questions.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_601b1d531bb4c.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/e7e9fd01e3efb20.pdf
    • https://cdn.sqhk.co/pevedapev/cji6ngc/hong_kong_minersville_phone_number.pdf
    • http://mazanatur.space/kusadejazhtnku.pdf
    • https://cdn-cms.f-static.net/uploads/4418558/normal_6019b6e9f3cb0.pdf
    • http://reform-st.ru/47933592900413io.pdf
    • https://cdn.sqhk.co/teketerep/9apbx13/84116494916.pdf
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/guwif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fewunadupop/past_continuous_exercises_questions_and_answers.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/basic_algebraic_geometry_2_shafarevich.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc5.bin
a7f3f277c383e632b27bd842331720c9383e8083de3b82b370547b7505356c65
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5036 bytes
font_01_sfnt_off000100cc.bin
a44f6d709816640435789b58ad460874052bf400dd8372c7cb4e04c6fb709e5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10516 bytes