Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8e20d66e08de85…

MALICIOUS

PDF

91.7 KB Created: 2021-02-05 13:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dcb9c21112f93240aa8390b261366454 SHA-1: 69046c26d948d36f2adc3f7cb8590ea0871aff3b SHA-256: 5c8e20d66e08de85d5e3bb5098656fb4c23ce86d9106fac90ecf5e1265233c1d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The PDF's structure and embedded URIs indicate it's designed to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

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://maypoin.ru/123?utm_term=call+me+by+your+name+ebook PDF link annotation
    • http://kyhni.site/muduxilhc8y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_5fd7509538425.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/judge_e_gregory_wells_wikipediama2mj.pdfIn PDF document text
    • http://trokot-roznica.xyz/fesaxapizumoulfqd.pdfIn PDF document text
    • http://pearhaidhr.fun/ornamental_plants_listiyrj1.pdfIn PDF document text
    • http://procripton.com/94933865036cr93i.pdfIn PDF document text
    • http://medgaj.com/baby_cuddle_lose_imprint_quality_speed_multiplier058y2.pdfIn PDF document text
    • http://prizinsta24.space/kesigerumemaxuwi9rygv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_6011350f1d843.pdfIn PDF document text
    • http://organic100.fun/metric_conversion_worksheet_1-402eyux.pdfIn PDF document text
    • http://rodsfish.club/rixojadusozokiwrnbo1.pdfIn PDF document text
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/1141561.pdfIn PDF document text
    • http://olx-delivery.cc/lfs_kamyon_yamas_tamindirfumzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_60178c090dc29.pdfIn PDF document text
    • http://pubgmobiie.com/56921456074s9cka.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/jazofi/xotoxezure.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/cancer_research_uk_fundraising_form.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_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 4864 bytes
SHA-256: a2639ce47d401fa3dd5aec05a92ec2ca962a72ec5c759ce1d48f805d364ccad1
font_01_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 11284 bytes
SHA-256: 82f886fbe4236b22dc6cde2a9c04eff5d1a0e13b267a2eb836436ed1be40284e

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