Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e30883d6fdee039…

MALICIOUS

PDF

73.4 KB Created: 2021-02-10 15:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 708f29e5b3f68ff52c9f3b9fc40d53a4 SHA-1: 174a711b45dd72d5fe41aa1c99850d098fc8efc9 SHA-256: 1e30883d6fdee039f9909f1b026330a5d13938debd90ac0cf6ce7f7915d0e041
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly support this attack pattern.

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://seumenha.ru/123?utm_term=warrior+in+japanese+name PDF link annotation
    • https://cdn.sqhk.co/desogepupema/ZKgggex/refusasojotopomanajibu.pdfIn PDF document text
    • http://boost-shop.xyz/advertising_script_bold_font_free49m62.pdfIn PDF document text
    • http://tevfikyuce.xyz/383427487819muv2.pdfIn PDF document text
    • http://hustlinmoney.com/61118993633584b6.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/bc1e013.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/0hesgjj/98337612857.pdfIn PDF document text
    • http://hook-up.fun/best_audio_reader_for_windowsa70ir.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/pilabewimadifoxijaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/aaV9mlV/tefukuwubep.pdfIn PDF document text
    • http://segwaywheelchair.ru/misujakogetbsyk4.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/5eb0024435f98.pdfIn PDF document text
    • http://yazansoft.com/vba_excel_free_downloadf1a96.pdfIn PDF document text
    • http://moresukko.ru/brendon_burchard_planner7r3le.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/99e40.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/tiramojutekipuw_zewidis_zuremaju_kixodixojanin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 5024 bytes
SHA-256: 2e1f43be15a4a27e31bd666b6704c8cf3031644dd09c5dc09aec6a6c37b83c00
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10472 bytes
SHA-256: a7215417eb61a0ba1388bbc0343de1db2bbadd84c16c7b2d13bdee6e752a3c71

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