Malicious PDF — malware analysis report

Static analysis result for SHA-256 56186a6664a7f295…

MALICIOUS

PDF

69.5 KB Created: 2021-02-23 01:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 388df78c67766357c9a664e372cf600b SHA-1: 21393baf5f9ea80c756ca0b26623c682d7a4b14a SHA-256: 56186a6664a7f29578a82877cece65bfff89cc7d04bd40342cd5d4763472dc2c
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-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://jacksth.ru/123?utm_term=how+to+keep+your+man+interested+in+you PDF link annotation
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/ab3441d.pdfIn PDF document text
    • https://ratilobavet.weebly.com/uploads/1/3/1/8/131858747/35e722.pdfIn PDF document text
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/8852701.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/bonuviberabelu_mikapiso_levetiv_zojumujonido.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/5035677.pdfIn PDF document text
    • http://falufob.iblogger.org/midutusi.pdfIn PDF document text
    • http://zapizimibit.22web.org/advanced_computer_architecture_ebook_free.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/surisoba_bafetodotutad_fufewat_tovimodor.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/gche6IN/dikunojonidevogofif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firuneta.rf.gd/58854281829.pdfIn PDF document text
    • http://gozulejawefufap.epizy.com/collegiate_american_school_khda_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/antinomy_of_common_flowers_english_patch.pdfIn PDF document text
    • http://botujovibal.rf.gd/project_management_life_cycle_ppt.pdfIn PDF document text
    • http://jizonizop.rf.gd/22995797251.pdfIn PDF document text
    • http://jobopomazawo.epizy.com/98003705406.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/australian_certificate_of_conformity.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/vazepe.pdfIn PDF document text
    • http://tigapoxo.rf.gd/juxarokeromuwagenutositef.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_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 5292 bytes
SHA-256: ae5da20cb8027efd413224ac90855093a82d19cd007efdd7de28fce31ab644b5
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10572 bytes
SHA-256: 4b29a7a083ede148aac4f5d97356b09163591dfafa36a555ce876e02eb652355

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