Malicious PDF — malware analysis report

Static analysis result for SHA-256 4055d979846c0c74…

MALICIOUS

PDF

166.7 KB Created: 2021-02-15 15:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0994e87d48df4ffccd831e5dfbe10698 SHA-1: 8085a98031705b56803d92bee07827eadaa5eace SHA-256: 4055d979846c0c743038ab5aa943114d5ee63f399169d1b6a30eab18283e6e88
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to known malicious redirector infrastructure. Heuristics indicate it's a link farm on disposable hosting and uses an advance-fee scam lure, suggesting the document's purpose is to trick users into visiting malicious sites. No scripts were extracted, but the presence of malicious links and the scam lure strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+literature+define+and+explain In PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/8764131.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/efgdKje/tideziwamu.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/8436205.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/hifc5g5/gopeneposuvebolodad.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/2iawSgZ/47293211289.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/2572675.pdfIn PDF document text
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/14188303d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapinogure.epizy.com/tikamesewazadulixatogad.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/wewama.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/sign_guidelines_endometriosis.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/93345902772.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_off000254ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254CA 5208 bytes
SHA-256: ef927993e063ce311a2bbc05cdb85cb8bd4ed89804c39e788ee9d9e0a221b333
font_01_sfnt_off0002668e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2668E 11392 bytes
SHA-256: a531a6bfd3009e106577cec8ca76ab2116be5d316f9f452aed07ad3b5d15dc78

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