Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ba39b521346934…

MALICIOUS

PDF

72.8 KB Created: 2021-06-09 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f779fa67ca9abfa9075982323fa7df3f SHA-1: 557f6359e1e203b1666549d2d08bddbd3a4ef6d0 SHA-256: 40ba39b521346934045c2cbd1ae5f4497b327677f8289442dd4366259541b2c1
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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://oniceh.ru/pbw?utm_term=wwe+2k19+online+play+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4409811/normal_60b1c7cf5403e.pdfIn PDF document text
    • https://birexekexujivas.weebly.com/uploads/1/3/1/8/131858685/7460792.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/xenorufaporegug-posajil-vuzexelubif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd26627a0fda.pdfIn PDF document text
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/9c7a9959b4bb.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/rugeregerob_litunokadazavu_sosizudiridodaw_vobimarise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fd3d2fb1cb66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6043dffe62cd6.pdfIn PDF document text
    • https://zenozuniwilifa.weebly.com/uploads/1/3/4/1/134131556/kusukakolopuwu-loduvoxotabuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujuboxu.pbworks.com/f/rational_functions_and_their_graphs_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0a7846-d1fb-4d74-8676-34842839730f/93132951598.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144477657/35613878623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811531aa-061c-4df2-b248-18fc0f985619/vuwedafinezepez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faa3af4-ee1d-4a32-8f6a-9412ae007252/86974922973.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144527502/bikewimifinumovotov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e6e0b0-ed0f-4377-a5ee-2e8909b07b79/kanejixapin.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493623/78187582358.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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 5264 bytes
SHA-256: bbd30dafcd31954160d0f40ffce6015323251fba1cfc35c2ec6b858117216192
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10728 bytes
SHA-256: 8450bb066b0d778b0df05846f052164e8b4b43d6552073ec69f5684f7079235c

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