Malicious PDF — malware analysis report

Static analysis result for SHA-256 8259880151ac8d8e…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 07:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20d8da61249f50e930051c480fc00590 SHA-1: 8d7ee0cc5903f2c5d31637e5db719076851d252c SHA-256: 8259880151ac8d8ef0c4dcfa450cb1b544be57cc780ae0cbd608da4840119045
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to fishing lures, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/123?utm_term=how+to+rig+a+stick+bait+for+bass PDF link annotation
    • http://idealicaitalia.website/why_is_my_clutch_not_going_into_gear3rh2a.pdfIn PDF document text
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/feead7ec.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/wofazaratavizugiliku.pdfIn PDF document text
    • http://moresukko.ru/23351573662ipni0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5ff2039a55074.pdfIn PDF document text
    • http://brumbum2.xyz/war_thunder_enduring_confrontation9rd1j.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/zFLKhbN/online_games_like_roblox_no_download.pdfIn PDF document text
    • http://strgb2.ru/73858952003v4bb.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/behAwPW/maybank_ezypay_plus_promotion.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/iiyjbS3/gazitowipen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fe88386d0e30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_60059060cff53.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/c41025b7.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/9324283.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/6IihbEu/green_pants_outfits_pinterest.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/rafiralexezol/android_adb_install_parse_failed_inconsistent_certificates.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/bydureon_and_metformin_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/befulurepetexilomej.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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 5272 bytes
SHA-256: ddd7f8d5ab565529956224d8b15631df3ad7f898bb267646760a5d59b0215f83
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10412 bytes
SHA-256: b2224e3d0d080a2bf4bcd1f2e8551db51235c41b3ca98c5d476d07e84b7ea8f5

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