Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8503a12f93bd37…

MALICIOUS

PDF

68.9 KB Created: 2021-02-12 13:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d6f9b6289d6dcefc5eea145b168db15d SHA-1: b88fcd99cdddf023a4fa8dd39c751a4f1c885628 SHA-256: 3c8503a12f93bd37e97d98e0ce861a240e7bff75c8fa2c78092bbb374c3f5532
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a suspicious domain that mimics a search result for a PDF. Heuristics indicate a link farm and ClamAV detection confirms it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content.

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 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.
  • 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/wix?keyword=gateway+to+art+3rd+edition+pdf+free PDF link annotation
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/rexon-xuzekowom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490949/normal_5ff5cafd2a449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ff5199c8fa0a.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ensIAV1/virtual_boyfriend_simulator_prank_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_6010a2178fc47.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/DjirWgh/jojexanesadegifaxuwov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6025f75d9c30a.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/5igjgec/cnc_tool_changer.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/ghbzroZ/83686246653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_5fd36d3a982bc.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/ggC69ge/swamp_thing_1982_parents_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9e07487f7.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/wgebxzV/74280964303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fccb55a74284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fc98ed648755.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/sezafolupepixatuvolu.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/X9vMjeR/61666621688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6025b07ebcbc3.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 5004 bytes
SHA-256: fb7abb6898313af05045f025d3052b055c3835fe348c4faff8212483a1842426
font_01_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 10364 bytes
SHA-256: 0496f125a95fa5358bb7a4c369e80218fa3f9266f24bc472eca59f0faaca40b8
font_02_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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