Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa41cf3b354adc3d…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 22:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 078750f2c8d603fd533de3db69eeffa4 SHA-1: b9adf5bfc5dd9d6fb2eb8d51e9104af4edfa8f11 SHA-256: fa41cf3b354adc3d9e3f657221a7b7a3c3bfa324ad69cd2ad614237e4e79fa4f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it functions as a lure to external resources. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=abnormal+condition+of+hardening+of+an+artery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60308b19d5e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0fa4f1fbf9.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/gQujgu4/teriw.pdfIn PDF document text
    • http://deemonatrafik.xyz/pazojozegzbsni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc68df20da8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_5fde873aae523.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/RkEgjuc/custom_stickers_for_cars_wholesale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369935/normal_60034f5a0a6e3.pdfIn PDF document text
    • http://wiregabjuk.fun/780740300460dyny.pdfIn PDF document text
    • http://disconto50.info/descriptive_writing_practice_worksheets4z42z.pdfIn PDF document text
    • http://gallery-shop.site/pokemon_roms_light_platinumx869a.pdfIn PDF document text
    • http://romeita.space/livofunalupineyq5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_601386b8b8bfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/76274015045.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_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 5488 bytes
SHA-256: dcb5f37fbb57a85605f6bfc8871e383e0b0a8e96240741c6233647aaa2f8098d
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 10196 bytes
SHA-256: 50ed417b884ce6de91c5194a996fa4cf0c9ef30bde05e8082bd252b0049eefd1

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