Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d13c003a4afd255…

MALICIOUS

PDF

75.1 KB Created: 2021-06-14 18:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af5d5123ec2f452ed49a613e80f06459 SHA-1: 56ea811d527c7e5360222215ca3bf051ecce01df SHA-256: 9d13c003a4afd255500457debbbd2c13107aa012112614508f5890ed8b0a06eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely to download further malware or phish for credentials.

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://oniceh.ru/pbw?utm_term=10th+dummy+admit+card+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420250/normal_606d57d32194b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_6019f4dfc9896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5ffce547975a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_600be8280d84d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff815a8d2ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6035a76be36e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_6061f89ded253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6035585ec357e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6056c5800a8cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_5fdc70d04c835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403117/normal_600871c1be272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5fd74107305ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144520887/32026223214.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/aether_portal_for_minecraft_pe.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144721800/random_video_call_on_google.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/bipuwoxif.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144564048/xukomurudafawemudutu.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/emotional_blackmail_by_susan_forward.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 4

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 4848 bytes
SHA-256: 802632ac8663ffa3b7212f18594b7fa3882caa82ef64333b66510d97dabd0409
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 11100 bytes
SHA-256: fa824ed5f09938d2cd30ca1fc323490dcc59324d15155f6c469349a2fccdbfde
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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