Malicious PDF — malware analysis report

Static analysis result for SHA-256 983cf97094ec24d7…

MALICIOUS

PDF

86.5 KB Created: 2021-05-31 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e304ddc4cc4a5f86408ee4c9e2ced51a SHA-1: 058da5e1cfbb7e7c9ee64d8c0a281c64d6d556e7 SHA-256: 983cf97094ec24d7e3a80e7752f6b15e88b997646773be4c778653487856945c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

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://pelibifir.ru/123?utm_term=fibras+textiles+sinteticas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5ff237d8c1424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60256fc665eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447258/normal_6053531a3263b.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/616072.pdfIn PDF document text
    • https://jibijuzevigux.weebly.com/uploads/1/3/5/3/135333604/pobinifusa.pdfIn PDF document text
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/gaxawigis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_604f3d2ce49a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd73b7bb4463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe3b912b1a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_601b808f15b20.pdfIn PDF document text
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/lesipokajaxuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418479/rukakunisoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2f7a0c-0556-44cd-805a-626ed552263e/vagaguraweganexifatitexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8878b1d5-0991-48d4-a5a6-7321b1fc64fb/iowa_code_321.449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a7d9e7-f2a1-4b07-aaaa-b7b98183e082/shark_-_ion_robot_app-controlled_robot_vacuum_-_black_navy_blue.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xeradalimelewi.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/15286665926.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 5312 bytes
SHA-256: 0a49e3d16a69a8954775993a5c1dc62e86ac0bb2d05bee506372b77bdbdebad6
font_01_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 11824 bytes
SHA-256: 9fa0eac09e058e0a3f63886a55278de0dfb7e4af1fb61f6b3ea7cb9df6f01138

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