Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c1dfb7d4d49fcf…

MALICIOUS

PDF

68.8 KB Created: 2021-03-13 19:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a1f6d4cd356abaff5737a0dfc7697b7d SHA-1: 758338716d12287069172d11f58adaba30403505 SHA-256: f4c1dfb7d4d49fcfc0939e0d111cca1925e66f2fc9dd3b4943162b0cf7868261
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The primary heuristic firings indicate a high volume of links, many hosted on disposable domains, suggesting a malicious intent to direct users to potentially harmful content or for SEO manipulation. The ML classifier and ClamAV detection strongly support its malicious nature.

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://dugedepap.ru/wix?keyword=volume+of+a+triangular+pyramid+khan+academy PDF link annotation
    • http://fukiwurezopukof.mywebcommunity.org/what_is_the_text_structure_of_the_first_paragraph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fda7111ac047.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/aws_certified_solutions_architect_official_study_guide_associate_exam_github.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/12_fruits_of_the_holy_spirit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5febd8eabcecc.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/94538848539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_60292577e0dd6.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/cooler_master_haf_912_advanced_atx_mid_tower_case.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5fd0d5a24a640.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/6cc7a173ba94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_60449259c6d55.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/131372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_600dde56e28eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_600fdefa2aa76.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/6811969.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/07293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watusatuvor.myartsonline.com/53352134516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacf4681-cd5e-41e1-be08-fbc115bca008/norstar_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03210e22-b662-4813-bae6-45f07d73d02b/95684603835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cbeb69-3cd5-4a43-af88-0088a489b40c/22582372666.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 5524 bytes
SHA-256: 1a69d243add403df59cf6926b69e1e7a30a6aca33735a2993a21c0a15ced3c4b
font_01_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 10212 bytes
SHA-256: 770441c52c0bc73cadf2703c9f1c58714214e71512795cf47d99c61bddc2be2b

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