Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d37a5d677824a2…

MALICIOUS

PDF

75.5 KB Created: 2021-04-19 07:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1927e99309dd841bbed3ff17098d307a SHA-1: 154e266050928718d773f9fc1dabdab0442ac6eb SHA-256: 92d37a5d677824a2483979fb675c84d9adabfdf0c357a65f101728d90755b07a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://jacksth.ru/strik?utm_term=2006+harley+davidson+sportster+owners+manual+pdf', is presented as a search result for a vehicle manual, a common lure for phishing or malware delivery. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=2006+harley+davidson+sportster+owners+manual+pdf PDF link annotation
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/60f541b96207e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_600b5d2e405dd.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/nojidiwemu.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/tiwat-gisata-ridomi.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/aOhh1hh/losakodegatosuxureligifex.pdfIn PDF document text
    • https://cdn.sqhk.co/duxevowoli/dsaHIWW/pepuduf.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/9782045.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/riduzexekugipi.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/ziginude.pdfIn PDF document text
    • https://cdn.sqhk.co/fixiwuwukufi/jaF9kFv/59932304809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_601f84486b455.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/mukefuluwisokanete.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/3d95b1c19461144.pdfIn PDF document text
    • http://gafaneripebenu.iblogger.org/presentation_folder_template.pdfIn PDF document text
    • http://xipukob.22web.org/antenna_theory_analysis_and_design_by_constantine_a._balanis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_0ca6c57c5f284f59aade647f0e488c43.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_c0277da71d524beb93cb48292ec67dce.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_2e8ca60b849e4f018055a0d7343ecd3b.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_4ddf8ff5c1094a6c991d2b2abaabda43.pdf?index=trueIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_b283fa190d61459ab4147f8395be039d.pdf?index=trueIn 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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5868 bytes
SHA-256: 4e71f297008579aefbe08968ec75aa290cdea835d3920d9148f7082bdc0bb261
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 11116 bytes
SHA-256: 1a21eb7d26845c7e51e28966c6129ea6cfcbec4eb860a19805ed631d4007b637