Malicious PDF — malware analysis report

Static analysis result for SHA-256 394c468104d3aaaf…

MALICIOUS

PDF

71.9 KB Created: 2021-01-24 12:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: adf4fe782f4a0933166aaf17b40e2528 SHA-1: 36c6eb6de74d396eefbbff860358e5e098a6e5f1 SHA-256: 394c468104d3aaafc6cffdba06b03c2c1b95fee06433032b3ffb7b59f86ee387
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, with a significant portion pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wb?keyword=veloster%20turbo%20for%20sale%20near%20me PDF link annotation
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/nebuvamevo.pdfIn PDF document text
    • https://tesetugunujogub.weebly.com/uploads/1/3/4/0/134040467/4984213.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/TfOpJhl/mobile_emergency_call_number.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/ehfhbpz/dixakorokivodajiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff0d4dd686d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd229d677b4a.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/cc8abed133eda.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/9932041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_600cea4bc9136.pdfIn PDF document text
    • http://qqkaxes.xyz/94408730880rahlr.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/xufujofaleki/86052536245.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/woxawebaroke.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/cello_and_violin_duet_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/1243728760.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/purewemasejarabegapiwuji.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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 5016 bytes
SHA-256: 7cadee72ee842ff7bddf9a2d3eb81ae8b56ee1f05e9997b1fd7629b4338a1cae
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10392 bytes
SHA-256: 50378bce6249baa3f09174862d556f88a61826b9ff9e8c0f053efa1d09b31026

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