Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eea4bd68dfd2702…

MALICIOUS

PDF

68.2 KB Created: 2021-02-03 17:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e9b71b3ef785256846f6b730bc9b5406 SHA-1: d0a7d7658d68ffbfc671c112a986f7d2fec019af SHA-256: 1eea4bd68dfd2702406c673c994a573ca8c954461a0c40ce198b60f21cdf67e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it's part of a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=show+n+tell+philly PDF link annotation
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/xejixiv.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/icEiaWd/sorotebixowewuvixikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fe81008726e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fee371430eee.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/gf5zPk6/20590602135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5ff3e3da69bf5.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/7506150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_600bcd8885aa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383918/normal_60013e36686b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tanemurad/gfYjfmy/personal_diary_with_lock_app_for_pc.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/5119367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_600bf19782955.pdfIn PDF document text
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/pipaloxagas.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ifUhe6Y/fear_walking_dead_cast_season_2.pdfIn PDF document text
    • https://jigudubexafodi.weebly.com/uploads/1/3/0/7/130738940/pepaxezumikisi-rokirajalepuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 4720 bytes
SHA-256: f932fe69c1ffdc9e67986681bfa465da553766042461602f99e5c8b4be9a41ed
font_01_sfnt_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 11672 bytes
SHA-256: ffb544124c3f398bc13b37f366e4f2091298fd00374b5ccd1c70289ad4df8737

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