Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d4105e8ab98fcc…

MALICIOUS

PDF

77.6 KB Created: 2021-05-28 22:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 098e5f763704431d79e6d2c48d3650ab SHA-1: dd753c2a6cd3e9dc77c8a340e7f864b5b4d2d6b3 SHA-256: a8d4105e8ab98fcc50dd0e40d2bd039295e01ad1abe7479e3f06a4315738e42f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+to+start+a+masonic+lodge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498834/normal_602f7f7e4f8fa.pdfIn PDF document text
    • https://neseriduro.weebly.com/uploads/1/3/4/8/134851425/8397753.pdfIn PDF document text
    • https://fefufivakelazi.weebly.com/uploads/1/3/0/7/130739222/15d60f6e1f7d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_604839bc91b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_601413ef6e7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_60251b9e16889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_602a17bcb91ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_600395934529e.pdfIn PDF document text
    • https://vifunufuwo.weebly.com/uploads/1/3/4/5/134596702/d2db3c57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_606690ae56877.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/daduxanupitit_fekakoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_600c032adf9a3.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/e85b9a7c8e079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_60562c2d1bac7.pdfIn PDF document text
    • https://gedotelebuguda.weebly.com/uploads/1/3/6/0/136050260/zujotunenuxas_kidoretubudin.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/xilezafetafibuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_6021f8c78ccc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_602fd6f6552c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_603ea9f375a62.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/rufujobunowupag_fawuve_givuwojik.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/258e9f3404.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/9b250f8f-2044-4a29-a04d-4b4c673d0d80/pycharm_ipynb_convert_to_python_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f1d9e0-7176-4dfd-8ae4-088d8cd16753/66039650768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193b2693-3acb-45ba-b51b-efa3ac8ea314/hundreds_chart_puzzles.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5312 bytes
SHA-256: 7aa042d9af0e14f981fb5f06fe56802425605217e361df5e3c966b2da37317da
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10252 bytes
SHA-256: 025dc0a6e7345a70d22fbb17647886411bc45ea70e1836980d0e60d5abf9d8bc