Malicious PDF — malware analysis report

Static analysis result for SHA-256 8343610a3155d3ba…

MALICIOUS

PDF

66.9 KB Created: 2021-02-19 20:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b02f8d685d58599bbc5212ce18fbb7a2 SHA-1: 8d6445cbc9721d9acb8ebc6e08d1ba149493a486 SHA-256: 8343610a3155d3bab226569fbb13145590050c33e6e09bab5f5da216619873f8
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 pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=following+1-2+step+directions+worksheets PDF link annotation
    • https://cdn.sqhk.co/rupizabiweze/ifHkKBi/19390031728.pdfIn PDF document text
    • https://cdn.sqhk.co/dilijenaka/gghaxdl/space_programs_all_around_the_world.pdfIn PDF document text
    • http://tegogigagozij.iblogger.org/10901464724.pdfIn PDF document text
    • https://pudijamarotu.weebly.com/uploads/1/3/4/0/134000536/8262143.pdfIn PDF document text
    • http://kigajekuterol.iblogger.org/lalupafapomoso.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/Uhdrfjd/nupikozuzenivesilemofe.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/muwiredufatomuwene.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/eLZDhfL/new_supercars_coming_out_in_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/Cj2N8jj/xokasiweretegow.pdfIn PDF document text
    • http://lubuwemobiso.iblogger.org/award_template_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/axidiiq/93864028617.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/jh3B4sp/mini_basketball_shot_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/iigjghE/85164767280.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/KJIajiW/amazon_fire_tv_stick_ipad_airplay.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/631000.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/novifamigot/burger_king_printable_coupons_july_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/behind_barz_drake_piano_sheet_music.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5452 bytes
SHA-256: 0cd1d109f3ba0fa2c8a9e1e4d57bb5e2ee91c3234a01f51d2e46447f035696ac
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 10492 bytes
SHA-256: 9450c1476420fe8e6ef1189021854ab2a7f3775e42851cf1488f62a98af8095e

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