Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e53329b930e275…

MALICIOUS

PDF

85.5 KB Created: 2021-03-09 12:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3c75c0a552bbc3d51f5b02f2c3696c21 SHA-1: 98cb8580df88f9d811f4f7a0942b5b535d0d4c06 SHA-256: 31e53329b930e275455de53f74c2b589988704e7c32ea7c780dce73fe03a79ba
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 0.9993

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://bologen.ru/aws?utm_term=what+is+an+underlying+notion+that+supports+the+12-step+program+of+alcoholics+anonymous PDF link annotation
    • http://photoforce.ru/18001224271q9btk.pdfIn PDF document text
    • http://xobuxok.22web.org/32683780475.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/vgyhfib/fruit_rabbit_bubble_gum.pdfIn PDF document text
    • http://opensalle.xyz/fit_for_life_eating_plan2wbjw.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/43174307369.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/4909830.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/53ded25068c79.pdfIn PDF document text
    • https://sixanatol.weebly.com/uploads/1/3/4/6/134631849/1656c53.pdfIn PDF document text
    • https://dovidememalow.weebly.com/uploads/1/3/4/6/134601329/piremew.pdfIn PDF document text
    • http://topstudy.fun/8059772106286jam.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/faa9bbc14112b.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hjjiejg/halloween_wallpaper_4k_hd.pdfIn PDF document text
    • http://kinokaiff.space/mofasuvizuresoa0iyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pobixedele/leica_m_lenses_guide.pdfIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_3403830df9e14cb7afbeaf50e23417fe.pdf?index=trueIn PDF document text
    • http://mebijido.rf.gd/video_helper_add-_ons_for_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/76249795420.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_142d55619ed64d5d8edd09242a1a1ff4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/72806495552.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_4bc3035ca3a5495382008e62d229c98d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/pn532_arduino_i2c_tutorial.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_f7d54005c6c742719a7294901aa40558.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_a4487bc671c64ae5b75f442a7ed46fbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/22513626050.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_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 5900 bytes
SHA-256: b77d106fd1c12de0e3ccce33651b838bac229092b504caa48d16aa1cc02b4322
font_01_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10432 bytes
SHA-256: 928fbf1c3d50b8258cbf9f21a04fb8cfb02e8dc5a5b9fcc4d06b583046cd4d54