Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a38338348132c32…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 21df9b18f0d9185cb01c393b867876f0 SHA-1: ce1de6594a60db9ddcebdc190e9fb734e5d76017 SHA-256: 4a38338348132c328890db861942ce874ed8c655d1ebf7e24a62237f72cf1cbf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting or redirectors, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'Dunkin donuts bagel calorie count' and 'wkhtmltopdf', potentially serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=dunkin+donuts+bagel+calorie+count PDF link annotation
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/7c3b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fca096250cb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5ff093ab25cab.pdfIn PDF document text
    • http://nujuxogo.iblogger.org/what_blood_pressure_reading_is_too_high_for_surgery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdf948a8c819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_6012514da3ef0.pdfIn PDF document text
    • https://zufunukilaje.weebly.com/uploads/1/3/4/8/134888690/dekozumelozekizudaz.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/gagobilawaxesabux.pdfIn PDF document text
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/ravigegafi.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/nazomirimibojarefut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fdc521b82571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6058c766b617b.pdfIn PDF document text
    • http://vosukotobula.22web.org/rapesabiroduge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_60615bc0b3ef6.pdfIn PDF document text
    • http://expressday.online/1672218554l5od8.pdfIn PDF document text
    • http://pek-24.cc/girl_scout_brownie_robotics_badge_requirements57atx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_603cbd9f1dc47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilulaj.epizy.com/distinction_between_criminal_law_and_civil_law.pdfIn PDF document text
    • http://gexagulajiv.rf.gd/82336645647.pdfIn PDF document text
    • http://wujidazigobad.rf.gd/tidilefaxed.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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 5308 bytes
SHA-256: 433457bb23537db562c57c8c197715d606584ecf247d546d51981aa1a5650cb0
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 10808 bytes
SHA-256: aaa8f14be5f714a101fc5bc4930b4ba5a2bb87c8780f442388647fc35718aecc

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