Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8ab57a17f41ffd…

MALICIOUS

PDF

86.9 KB Created: 2021-03-02 07:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2e8dad1a85ddee7ee66c2666360324bc SHA-1: a41b085f499aad2ed6c457bdd179d4add0d2505a SHA-256: fc8ab57a17f41ffdfc9cea46e205b3127e5b6da57e072b9b470683f4b0a96380
126 Risk Score

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 high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or scam operation. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=stellaris+commercial+pact+benefits PDF link annotation
    • http://jawixogu.mygamesonline.org/chromecast_model_h2g2-42_specs.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/posakusuxuxex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5fc702663c426.pdfIn PDF document text
    • http://rerubin.space/bazerebelujonujaragiga5w2.pdfIn PDF document text
    • https://lesaletalakiwop.weebly.com/uploads/1/3/1/3/131379456/denezix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe66cde10b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601af4bfc0f0f.pdfIn PDF document text
    • http://italywom.space/vijujexewonimuwugopxjq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitulogakapede.myartsonline.com/protest_song_analysis_worksheet.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/bedebaradukobamakitela.pdfIn PDF document text
    • http://sutuguve.rf.gd/echo_srm_225_weed_eater_fuel_mixture.pdfIn PDF document text
    • http://muwakibe.rf.gd/equations_format_word.pdfIn PDF document text
    • http://nowavef.epizy.com/49159187430.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_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 5404 bytes
SHA-256: 981eecaa9c79f9e42396891f4cbe65907c8b15b0d1eff16d1963a6ea08cea389
font_01_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 10540 bytes
SHA-256: 94aebd772d5e1d2b2396eb2374b0dc5ebe5069b8eb928e3791ce50396ef2768e

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