Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaccf8e93838fe2…

MALICIOUS

PDF

75.6 KB Created: 2021-02-17 14:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a069a3b853be730c156e07676d102191 SHA-1: 8a1e0c7b4e16eb0a8cfd95fd389a77d78383f5d6 SHA-256: efaccf8e93838fe26b321c66ceb04f428332a2d662376854720d31aee011f5cd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate an attempt to disguise malicious links within what appears to be a document, likely to trick users into visiting harmful sites.

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://bologen.ru/strik?utm_term=what+is+the+tone+of+the+poem+the+road+not+taken PDF link annotation
    • http://fisidijomufuto.22web.org/hollywood_animated_movies_2017_free.pdfIn PDF document text
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/ruvosim-pogapade.pdfIn PDF document text
    • http://help-verification.com/what_to_eat_for_breakfast_elimination_dietatqff.pdfIn PDF document text
    • http://specrazreshenie.com/9713909401380v8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fe60fefbdad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fcf397cbea2a.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/fokul-wipoxibixex-masoruzaraxuzur.pdfIn PDF document text
    • http://luminar4-download.xyz/spend_approval_matrixvyvyg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fca33177a67f.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/53c505.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/ratigexuz.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/2b90ebf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogadamarixufa.epizy.com/79895013869.pdfIn PDF document text
    • http://mujaxeb.rf.gd/osaka_train_map_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/trombone_sheet_music_jingle_bells.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/63615083627.pdfIn PDF document text
    • http://zavivemigowoson.epizy.com/retail_consignment_agreement_template_free.pdfIn PDF document text
    • http://wawutanow.epizy.com/babbar_bhojpuri_movie.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/badri_movie_songs_isaimini.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5324 bytes
SHA-256: 67177ba59fa8458215ed9e9fd78421d0e2e7d746fe491cbce8bb1adf4c5f9cbd
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10952 bytes
SHA-256: 8c5e077cec65a888a9728d7ca851d39367f49104d28d7126ad30b6183d9a11f7

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