Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0995747c905f3b…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 17:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85c6df8958857e987023272fd9b8a646 SHA-1: 71f7e186c8cc0eaea7857b86df45ee1cdb0d1146 SHA-256: fd0995747c905f3be5d7d3219781e67f12ca8c0207ed8d4908964056519bc4e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body and embedded URLs suggest a lure for a printer driver download, which is a common tactic to disguise malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

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://mezovuduw.ru/123?utm_term=brother+mfc-+j6520dw+driver++uk PDF link annotation
    • http://confirmationhelpcenter.com/84383487056nr23w.pdfIn PDF document text
    • http://kellys.space/levedakonugapadexc7xj.pdfIn PDF document text
    • http://unlockdeals.shop/revatodonafusekibewanigzce35.pdfIn PDF document text
    • http://heleogose.online/theoretical_and_conceptual_framework_in_research_proposal_ppt0bu29.pdfIn PDF document text
    • http://familyit.pro/lodagavumadinadifewilevokjmn2.pdfIn PDF document text
    • http://kotigowaxed.iblogger.org/equifax_credit_report_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601d20bfb9079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488592/normal_5fc9978ff41af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fd37e8660014.pdfIn PDF document text
    • http://sovetnik53.ru/sozamifed5u2kg.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/gemanabedunufisakub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6029b0cfa30f9.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/sleeping_beauty_waltz_piano_duet.pdfIn PDF document text
    • http://govugododuwo.iblogger.org/48337030968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fezenur/thin_layer_chromatography_book_free.pdfIn PDF document text
    • http://vavogave.rf.gd/glioblastoma_multiforme_and_astrocytoma.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/is_tesla_3_worth_the_price.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/longman_collocation_dictionary.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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 5764 bytes
SHA-256: a01859092f5c02bc89ea3d44491afc3e220a71aa06772057d40dc542c52c6167
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10844 bytes
SHA-256: dc902f94f6ae6d2940ca373442dc63db0e837bcb05337b0f85c88b5a3abd25c4

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