Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db2c07eb00b1530…

MALICIOUS

PDF

87.8 KB Created: 2021-02-21 17:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e8c48a4b1d2f3a2794844ad4ae43449 SHA-1: 75b02bb45cfc2f3d612f503f7b4e0c468c326dc9 SHA-256: 1db2c07eb00b15304767c4dbdf0c689256b63417d126a3a93c29a7237a923894
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'bologen.ru' and appearing to be a lure for 'west coast choppers bicycle value'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=west+coast+choppers+bicycle+value PDF link annotation
    • https://cdn.sqhk.co/fuzomorikat/fjahfie/weed_eater_home_depot_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/jbijhat/pappu_pari_wala_cartoon.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/cidRzih/14406111033.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/Hjam7Rw/top_10_video_game_ringtones_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451950/normal_5ff50b3f05340.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/5jajeih/zoo_animal_coloring_pages_printable.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/kenmore_convection_oven_not_heating_up_properly.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/jdtMjfK/hashtags_for_instagram_photography_page.pdfIn PDF document text
    • http://vsspb.ru/xijumonurozibowulibshy9.pdfIn PDF document text
    • http://liolika-rsya.ru/windows_10_1909_nowrlkpb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwipekimati.rf.gd/88043411383.pdfIn PDF document text
    • http://dezenaxo.rf.gd/barf_si_lyrics.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/tenerife_accident_official_report.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_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 5336 bytes
SHA-256: 708ea59d72967df061a21a357f43978556ed9c9e94bfcaabf90a30f325b1e07f
font_01_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 11316 bytes
SHA-256: 5ae9adc58071fc882b6ab7620c88a12ec3f476782995b04a124623bef3bf8121

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