Malicious PDF — malware analysis report

Static analysis result for SHA-256 59673843002b5afd…

MALICIOUS

PDF

84.0 KB Created: 2021-02-26 03:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d0ce58e739030ce177d1ea5e82e18202 SHA-1: e704f463d1f4ed9ceff65263508dcb62f421ac7e SHA-256: 59673843002b5afd9dda0b6fa503a4310fac7cf01485bd0c3fe3594e96e9e419
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it's a link farm on disposable hosting, likely designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure or a downloader.

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://jacksth.ru/award?keyword=attack+on+titan+anime+character+database PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5feb5154e2e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5ffac997cac00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff0bb181670a.pdfIn PDF document text
    • http://tehnotop.site/pisabejereloz94cm4.pdfIn PDF document text
    • http://vukuwupevipe.iblogger.org/22059021110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602c09a1358b1.pdfIn PDF document text
    • http://allrecipes.pro/22899795560a0wcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_60130636d4851.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/lubukikames58snh.pdfIn PDF document text
    • http://tomorubi.22web.org/sedujurafuwiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagajawonusagu.epizy.com/contoh_askep_bblr.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/gumazeza.pdfIn PDF document text
    • http://sujetokotew.rf.gd/who_guidelines_breastfeeding_hiv_positive.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/29502577341.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/battlefield_3_serial_key_generator.pdfIn PDF document text
    • http://sufapanizesemot.epizy.com/63366368375.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/foworajoregisofirof.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/allegedly_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 8932 bytes
SHA-256: 74dc01cd183fc52947d26ffbf35b72873d22f81d2b979a38a13fe8871bfec196
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 5340 bytes
SHA-256: 36eebe96ccca42be7205052c3a7adcaac6d9c0cef05f5d22a9c6b45b4b2f4eb0
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 15644 bytes
SHA-256: 66a2eb9b870d500df3097d8a57546a5c49482455aebe3f76d6b03375944c73c0

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