Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c58b78f05397660…

MALICIOUS

PDF

81.5 KB Created: 2021-04-09 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3dc674b8baa9f6693a6aec8627dbf02 SHA-1: 8ed13139e6de0f05e79b6b46cd8838fb8ae0f6c4 SHA-256: 7c58b78f05397660e2e350a1354bf041a19ef4fe3c89b4e391a1c318bd1bcfd3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=actron+elite+autoscanner+clear+codes PDF link annotation
    • http://obzorov.site/waliniforozypeci.pdfIn PDF document text
    • http://getveran.site/theoretical_framework_experimental_research_exampleqz5kd.pdfIn PDF document text
    • http://mmmuuuue.space/reralopole4tq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_605a77e9afebc.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/satezujepovunabonubetsfd31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_604d2253878b6.pdfIn PDF document text
    • http://poopo.ru/7_little_words_free_bonus_answerstkuw7.pdfIn PDF document text
    • http://fb-copyright-help-from.com/doubt_a_parable_themesxqo4n.pdfIn PDF document text
    • http://stnold.com/511630355084nxyw.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
    • https://s3.amazonaws.com/fusopoxipo/movies_counter_bengali.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_c9a5d12383374cee83d7ad7504d2e92c.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_41860347ce18487d880917a19ae32ea8.pdf?index=trueIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_e1d877e24377495bbab47a55c4424162.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/taco_bell_macro_friendly.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_83cae645d3574448a26003b700a66b3e.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_0c540229b5ae416da5d76e2411f55746.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_4401efbb6aa54478a444e3cb251aaf6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/3768206568.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/why_is_rare_disease_day_important.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 4804 bytes
SHA-256: 430747710d773c02c681debe60d759914ee732a12a88b8e87821775c536b42f4
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 11220 bytes
SHA-256: 9f5d93b603d439f0b73ed42995c1f08afbcbef6de5bfb429a47f1e962f33b633
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3