Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff80a73ff74b70c0…

MALICIOUS

PDF

87.6 KB Created: 2021-02-26 13:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f8375f0946d252337f58eb8c850b565 SHA-1: e633f579cf3a864d128403860029ea35617aa1c8 SHA-256: ff80a73ff74b70c002759e93bf0b2d9c6540bc73a6e03584f8043ae993cee5fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, suggests a lure related to state names, likely to disguise the malicious intent of redirecting users to potentially harmful websites.

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 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://seumenha.ru/123?utm_term=what+are+the+names+of+all+50+states+in+alphabetical+order PDF link annotation
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/gaxom.pdfIn PDF document text
    • http://desokore.medianewsonline.com/30328413146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_60066429eea10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_60206a48ae6ae.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/iata_dangerous_goods_regulations_2015_free_download.pdfIn PDF document text
    • http://hookup756.fun/35490617873h89kv.pdfIn PDF document text
    • http://stav-games.ru/information_security_for_beginners5ctp0.pdfIn PDF document text
    • http://7evenrp.ru/best_online_daily_planner_app9bb11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe367acbe960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_602ff17b0a7a8.pdfIn PDF document text
    • http://pixelbarista.com/47070062363mb6jd.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/xapepetobivuwerazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff4fb9d7e3b2.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/walaberazum_reruvugavewodog_jezipifibugav_kunokebusew.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/0bf5a.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/fujizowevedurorovaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinofemuda.rf.gd/ofsted_report_for_heathfield_primary_school_nottingham.pdfIn PDF document text
    • http://musaluxug.rf.gd/formato_de_nmina_sencillo_en_excel.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/pesijefinokasatediko.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_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 5812 bytes
SHA-256: 024c33991e679724f96a4f75c182d9460a11e055f1ad5ee9d8a016203c363fe6
font_01_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10860 bytes
SHA-256: 2c8a4b52416476e2eceb95420e33325ea5ab0a00d585a2d1219e717c67abcb56

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