Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c234593fd83e961…

MALICIOUS

PDF

72.4 KB Created: 2021-06-14 13:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b0e221149f9a82580d1636b0672f625e SHA-1: c62a8ba1d1cf361978b8ede318cfafc217dcff40 SHA-256: 5c234593fd83e961dba195882f920ac323a5be6cb2adb42f0d20adec9acd8cc9
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious workflow, potentially involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=a4+picture+collage+template PDF link annotation
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/mezedanesosaguritozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fd6fe73740e1.pdfIn PDF document text
    • https://zinubokutedoses.weebly.com/uploads/1/3/5/9/135956806/e7f7d29.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/budeg.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/2563117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fe370be2e62f.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/7af813.pdfIn PDF document text
    • https://fovinekepug.weebly.com/uploads/1/3/4/5/134587719/85b2b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60180dfaa5765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_600219a0456a2.pdfIn PDF document text
    • https://nabozuritofawun.weebly.com/uploads/1/3/1/8/131857241/posuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_60646eab47adc.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/7cdb08a5-2c3f-4afa-9d2b-92d2c7a933df/sigijifalalisomalufe.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/hide_online_hack_mod_apk_latest_version.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/w/file/fetch/144603825/levitow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffc4fb1-1de0-4b6b-a999-d72ce3075ae8/17286249717.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 5152 bytes
SHA-256: b4e8e58a6e02589311e054aa81f39561785cc6b8ac3c55fd28943fb5c2602bd9
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10248 bytes
SHA-256: 28143ec10efb402e5f46aa2a0f4b26927842e07709e3623ce33b911d4ca6a9f7

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