Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ae35a3073fe3d2…

MALICIOUS

PDF

74.5 KB Created: 2021-06-14 06:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a73e659c8864b43114b25a9d1a37b1f7 SHA-1: d2c8cba12b459c6150e5ebd93077d749125cc384 SHA-256: b9ae35a3073fe3d2c70683a88817b290071885629a0bf08e317de7e0e90684f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites or download unwanted software. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=interchange+fifth+edition+audio+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377704/normal_605826522b78c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5fcb436545ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_601a843db012e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_604b8c202fcdd.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/bavopom.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/316519.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/1113981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_6013c3d848b43.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/ecac5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c465b024-f56d-41af-8b86-cf937a537120/kenwood_ts-570dg_hf_transceiver.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/w/file/fetch/144829674/35072106273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95a700b-2ad3-48ce-9c39-f5f378369ff2/72052299024.pdfIn PDF document text
    • http://fisagibop.pbworks.com/f/bunexuw.pdfIn PDF document text
    • http://xijujik.pbworks.com/f/zegagimalorakatonuwe.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/evacuation_plan_by_jacob_billings.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144999573/4_your_eyez_only_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c361d3ad-2a31-48d2-90e4-de06ec83a99d/jibesaretit.pdfIn PDF document text
    • http://favakiwosut.pbworks.com/w/file/fetch/145214649/subnautica_item_id_list.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 5132 bytes
SHA-256: c483e9d9b6cb91cda98d34fd3890a399af8454efb02fa57609b9edd22a9f1f8d
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10928 bytes
SHA-256: 7500ca9a838d70239f5a863af6b0be6c48ccbff3a3e240b561208fd31aa8bf84

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