Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313ab4c0a20075b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-08 17:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5d4d98e6e2bc962665ae9359221f49a7 SHA-1: 9b9dc1ac89071d73df80bbf517efbc602b11eecc SHA-256: 0313ab4c0a20075b56890cfa6e02bc2abe480516e2f7e95ea0b173ab0ca19631
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to Microsoft Excel spreadsheets, likely to trick users into clicking the malicious links.

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://druttle.ru/aws?utm_term=microsoft+excel+spreadsheets+for+beginners PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/D0jjjid/23230169235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387428/normal_5fe5d7c30e026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_6019ba2f6e57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fe8ce82ac1c2.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ngjCOja/13381055799.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/fkcTifL/gipezuwiwibasemedaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/giibb98/rofifoforemibepelevit.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/9UPhhgh/group_video_chat_app_for_android_and_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/6Z8sKWo/21267199254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_60013ba22cddc.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/jeriage/faridafutuzif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezaxakanopejux.epizy.com/vutulijukisilavuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/oxford_english_grammar_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/4686594899.pdfIn PDF document text
    • http://gulopajekojof.epizy.com/sejaporupomokujisejorema.pdfIn PDF document text
    • http://telewazikenap.rf.gd/14025518879.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/31912985274.pdfIn PDF document text
    • http://gamugeko.rf.gd/12055402134.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 5632 bytes
SHA-256: 5d4af139068a4d16da783c3df4f9ec14c5a9cf1b892c29e802296d7ccee3ca7b
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10564 bytes
SHA-256: 95938ab6a9ce0cab14202c7648b52ba373b14756ad6c114a6c6ed9f0844acf6c

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