Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7f575d249f776c…

MALICIOUS

PDF

75.7 KB Created: 2021-05-03 11:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d9629b0bfaf4691c17239a68d920dc81 SHA-1: 284295a71e8f6ef9dcac4a57464859c2b5b097b3 SHA-256: da7f575d249f776cc861025dfd84196cd40f21ff1c5388cce1886101a4ecf684
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting a malicious purpose. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=what+does+trees+look+like+in+autumn PDF link annotation
    • http://kernig.online/game_of_thrones_clash_of_kings_ebook_free_downloadeqkro.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/denumanogidirakale.pdfIn PDF document text
    • http://hookup673.site/how_to_obtain_medical_power_of_attorney_in_indianafchz8.pdfIn PDF document text
    • http://rivalo130.com/chicco_keyfit_caddy_reviews5u5s6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5fec73680e.pdfIn PDF document text
    • http://raifaisentapp.online/discounting_of_bill_of_exchange_meaning_in_malayalamx2edf.pdfIn PDF document text
    • http://topcreditcheck.info/38491376247odw1n.pdfIn PDF document text
    • https://luxisawevevolal.weebly.com/uploads/1/3/2/6/132682936/1793032.pdfIn PDF document text
    • http://idealica-official.website/pikanurajitho7t1.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/lavaref-detixupaluse-xodesexexala.pdfIn PDF document text
    • http://getyourscore.info/gejawoxorh1ioc.pdfIn PDF document text
    • http://shop50off.info/lenovo_ideapad_3_review_81we011uusxwjgz.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/7434813.pdfIn PDF document text
    • http://sravniproxy.info/rebarovorabaropuvevevtyvl.pdfIn PDF document text
    • https://rezawefid.weebly.com/uploads/1/3/5/9/135978206/3881682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fc89bfa6c89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_6011c4784f95a.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
    • https://s3.amazonaws.com/jesidofefe/banosofenex.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/zuzurukaxafilujek.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/debikutozumedafejatumeke.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5024 bytes
SHA-256: fe9da44ba8e3acf0dc158321665646f0baf34ab36750f3372349f42b95c9a2ff
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10468 bytes
SHA-256: 252237ed9f2692ac3b2f82240373d8ce5935d2e01ced2d0148d1c5255c0efc0e
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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