Malicious PDF — malware analysis report

Static analysis result for SHA-256 0640def18d712af0…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 07:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 000f6159dbbdeb01b305960fc9082050 SHA-1: 88b8eb43116a44f50cab4f5883d8661cb25ee0c4 SHA-256: 0640def18d712af05eebbffa53d5d760f342084bc96c99777cbf995034a25601
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The PDF structure and embedded URLs point towards a phishing or malware distribution attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=ask+and+it+is+given+barnes+and+noble PDF link annotation
    • http://polanuredun.iblogger.org/pinomuwifikovivagozini.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/mhijeNz/nefofufinapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_5fcf4b8c33642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_600c3c69cd961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_5fe70babd254f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_6022b0470a0dc.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/hcgeghK/in_flames_dead_alone_tab.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/velazexivida.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/ihlie16/live_channels_app_for_android_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5feda0cec78a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5ff229d0625b8.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/kutazibuvixodefuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5ff3043ca1f91.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/rujabepifar/75856711892.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/48111237841.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/87807512067.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/business_plan_example_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/corcoran_manhattan_market_report.pdfIn PDF document text
    • http://xinuxupenaze.epizy.com/tafabusutukikesazikisoxi.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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5244 bytes
SHA-256: f83cfc182c2280d9d0db8696aac84e22c688dd311f778f8b82238e17303f3171
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 11636 bytes
SHA-256: 5ac163276a516f62ee3181144cccd39b2ea62e986a9d510bafb1375c44264193

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