Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5688c4d83cc657…

MALICIOUS

PDF

118.2 KB Created: 2021-01-01 17:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d38584262fe4f78d2117848dacdd8e62 SHA-1: 993b4f9877db54101f571539d8576e4eaf92bf15 SHA-256: 8b5688c4d83cc657cafd2bf42b4a76ff7f344c91da846722d877d5520e2da0a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one pointing to 'https://traffset.ru/strik?utm_term=roller+skate+flip+axles', suggesting a phishing or link-farming attack. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to redirect users or execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=roller+skate+flip+axles PDF link annotation
    • https://cdn.sqhk.co/wozepefiga/bjarXkb/rujuxirijimojegixuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fd7f88b19e37.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/vif4jaw/xakubasazezugoxerox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fad8216646c7.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/eblfjfs/vugisejakowunalelazi.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/hbRAP17/terraforming_mars_prelude_card_size.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jhL0icP/the_angry_birds_movie_2_cast_and_character.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/EhaoJgj/palud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5fa94fb5df854.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bisikepuro_lerezet.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/idNrMq6/hitman_s_bodyguard_cast_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_5f9d410ae2484.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/47c6f75a-cfc4-4f9e-b973-70ff78c84ca9/nivubuxiredijuxalezujeg.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/apartment_lease_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/pujabafidifuzolowujudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b4675d-bbd6-4d08-8ead-2e02be4f17f5/kesisepasipigulafum.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_off000191f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191F9 5036 bytes
SHA-256: eca569fb8924b41b09c11cb68bd2ded683e3377139db1642f1044a7d2ff28068
font_01_sfnt_off0001a337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A337 11988 bytes
SHA-256: bca72ba97202486c381a07c07b79553e7d8e06a94ae9ff27319d4b4ea9f44ce4

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