Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78bc29fe41029c…

MALICIOUS

PDF

69.5 KB Created: 2021-03-03 11:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ce89fe6eeaf2398a210e274e4865b9bf SHA-1: 37af0ca34a73c98a7a0810f75559010e114de5f4 SHA-256: 8c78bc29fe41029c7e6c1938e0f8f2548812c1da223dcbcfbc3f324e5bcf1516
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 embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=certified+honda+outboard+mechanic+near+me PDF link annotation
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/8510238.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/best_pocket_icu_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fd2341dd13ec.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/what_is_social_construction_of_reality_theory.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/brobar_boli_full_video_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5feec39177fa5.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/7776340.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/bggicaF/jidodijez.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/23454660075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_6003963d818ff.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/48917388927.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/fab5907c7d800d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lanelubeberasi.rf.gd/60396553760.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/9671258873.pdfIn PDF document text
    • http://nidomovux.epizy.com/how_to_set_the_clock_on_a_pioneer_super_tuner_3d.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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 5096 bytes
SHA-256: 6ac54469cdd9dc4ca2233675f9a73e9f20d45065ce47237fb513f945e0874089
font_01_sfnt_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 10260 bytes
SHA-256: 792379f37341716e8250de8795b5c6ffca75b7703ff568eaf518435686460318
font_02_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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