Malicious PDF — malware analysis report

Static analysis result for SHA-256 5215b71d3c173476…

MALICIOUS

PDF

93.7 KB Created: 2021-03-14 02:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 461e6c3730c34ee35b24e5c19b4ffd5e SHA-1: 41edff77942f83168c78ec4b2dbf51945a929682 SHA-256: 5215b71d3c1734763fd499e9ecd475965351ba578792bc52ac3300ae7db9b1cc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=rheem+hot+water+heater+warranty+phone+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5ff654a4e4ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_60151f1a9249f.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/babinotubuledu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_60145f3096ebb.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/2ab55.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/fubitoxoxame-kamopezipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_604a9e4d8c5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5fe546d62fbd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_603274be2b027.pdfIn PDF document text
    • https://jabefebilinoke.weebly.com/uploads/1/3/0/7/130739415/8640227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_602e99848811a.pdfIn PDF document text
    • https://jomijumad.weebly.com/uploads/1/3/0/9/130970003/tuvujimififo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_6047278d3345e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukavinu.rf.gd/29147858915.pdfIn PDF document text
    • http://limekukojaso.epizy.com/fopekapomeg.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/astrology_answers_tarot_definitions.pdfIn PDF document text
    • http://numaripokusuj.rf.gd/53223869201.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_is_a_box_of_romeo_and_juliet_cigars.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/merovevipolaro.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/gugobeluli.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/98002027809.pdfIn PDF document text
    • http://fepadegan.epizy.com/definition_of_formalism_jurisprudence.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/53670363108.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 5192 bytes
SHA-256: fe6e112543217316c885d5b736062a4198e9f7fa50857b88c25ba09845439db6
font_01_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 11356 bytes
SHA-256: d325f593e85a2b1e27d7d334a19aca46a4ecded2f4072ce0f1489132b36c5222