Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d701ce42201671…

MALICIOUS

PDF

95.1 KB Created: 2021-02-27 12:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78f161c78f4e03565ee0c0ad3199c176 SHA-1: 201b2f9112ba3f75fe8fc8d346de48fb4425e4dd SHA-256: b5d701ce422016717dcf38eb5224fad0c2f458b3e3e255b10761b8e946a17c08
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. The embedded URLs and the document's structure suggest it is designed to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=digital+forensics+pdf+files PDF link annotation
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/riser.pdfIn PDF document text
    • http://center-san.ru/5_criteria_for_evaluating_sourcespzoen.pdfIn PDF document text
    • http://boevoenlp.com/value_engineering_programbr9vn.pdfIn PDF document text
    • http://jakor.pro/mewivumiburuvotosoboxt36vh.pdfIn PDF document text
    • http://profapp.pro/energy_guide_label_lookupo2y1h.pdfIn PDF document text
    • http://verification-help.business/hachiya_persimmon_zonevosu9.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jwBgehb/snowfall_2020_return_date.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/9220570.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/buhf1je/grail_knight_vermintide_2_cosmetics.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/biabITe/45363971730.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/CG8RhjP/bike_speedometer_repair_near_me.pdfIn PDF document text
    • http://vedice.ru/vamolavapeuayii.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/iiaigic/snow_bros_original_game.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/ja2zNnw/bowling_guide_rail.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesojavutuv.epizy.com/architecture_residential_drawing_and_design.pdfIn PDF document text
    • http://fufezexu.epizy.com/40991616730.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_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 5320 bytes
SHA-256: 1b8a0132f47afd23e90b54f1a43ed1562702f5014f1347ef0f24bf897cf8571d
font_01_sfnt_off00014b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 10536 bytes
SHA-256: 98e271fb4ebad8d115942f05847bb8618618e6f18e148a02a7f756858d42e65e

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