Malicious PDF — malware analysis report

Static analysis result for SHA-256 e927210431796c84…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 10:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17c7f87fe958bebfa2d25fc32e436ea9 SHA-1: 2614486564693b2a9ab7c1d93e3c7e36a49d0be6 SHA-256: e927210431796c846667f8bb29d0d62b01b191469aca2a93a1148bb5d2fa6cd6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+improve+a+dirt+road
    • https://cdn-cms.f-static.net/uploads/4407997/normal_603942a95a05d.pdf
    • http://ruvaruvifovuk.iblogger.org/hey_jude_ukulele_sheet_music.pdf
    • http://rijewomel.scienceontheweb.net/digital_design_speakers_12.pdf
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/zegakuze.pdf
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/dd5986.pdf
    • https://cdn.sqhk.co/suxupijisajo/cF9o8ig/class_9_social_science_solutions_rbse.pdf
    • https://static.s123-cdn-static.com/uploads/4380681/normal_5fc7f505394e0.pdf
    • http://pepariravifaza.getenjoyment.net/research_paper_format_template.pdf
    • https://cdn.sqhk.co/bupewazadufa/jdWhjs3/jotobajatokipaboruliz.pdf
    • http://pixidilivutep.medianewsonline.com/15752018876.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mugomodag.atwebpages.com/jojonuxigejofefogokazo.pdf
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_dceb63cbfe374fd48a9571f34a3b0e42.pdf?index=true
    • http://wapofele.epizy.com/how_to_set_digital_timer_on_vaillant_ecotec_plus_boiler.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_95bd02a68317430d91cb4f3aeac18c3b.pdf?index=true
    • http://sudebitije.rf.gd/cry_beloved_country_summary.pdf
    • http://sapovupiz.rf.gd/78872576500.pdf
    • http://wetepizibora.rf.gd/sikezab.pdf
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_0d62dba921354ce3bfc34c912445ec20.pdf?index=true
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_aad0fc37eb3d4783aa083af037a18fc9.pdf?index=true
    • 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_off0000ed69.bin
7cd60fee7e6dfd5f0314e802896cf8a529163d72a639aea793c7d2c44b2fc999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5008 bytes
font_01_sfnt_off0000fe6e.bin
dc6e38191528daf7c9e678c95839860f1de21aef8aa77ed5197d29a700c9b16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10716 bytes

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