Malicious PDF — malware analysis report

Static analysis result for SHA-256 531249b305c58f1b…

MALICIOUS

PDF

73.2 KB Created: 2021-02-11 04:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9eea92ecd0d40b564a8c2b322ad70dfa SHA-1: ab999938081f5248bee228cc6dc8e0b448eae171 SHA-256: 531249b305c58f1b059a2893cde16df9a8e23fbb36416c272b44001244314506
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

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://seumenha.ru/123?utm_term=kamik+greenbay+4+damen PDF link annotation
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/864b6ace1fcc.pdfIn PDF document text
    • http://balonixom.22web.org/thank_you_letter_template_for_students.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fcfb03b685d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5ffcd08dc2814.pdfIn PDF document text
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/badawuduzir.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/jolese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_600d42d25a251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6019ccde91ce3.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/47172891704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392666/normal_5ff31b93d0de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_6010a5aa6177f.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/laligelujaludugexi.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/dipiko.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://vexukaxazixaxet.epizy.com/xesuvadekuso.pdfIn PDF document text
    • http://kinuzana.rf.gd/sekufazewas.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/wozelexebuta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 4896 bytes
SHA-256: 3b82878534e20131e1f2781f2a39711c04e85726f592a63d24afcbfcba9fe6bd
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 11424 bytes
SHA-256: b066ae21144269429a9039099c8db978eed15910336584e832afb33a12967518
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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