Malicious PDF — malware analysis report

Static analysis result for SHA-256 673e0351e17b4be5…

MALICIOUS

PDF

82.3 KB Created: 2021-03-01 01:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 71f7db4852c4b663683c7985ca657398 SHA-1: 8660d95ef62f612a2a7d7e8f3b8898f3da64d30b SHA-256: 673e0351e17b4be582173cf822bc856ca516e9bacec7196390567266c2f0a6ca
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to Python programming, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+are+the+different+types+of+statements+in+python PDF link annotation
    • https://cdn.sqhk.co/siboxowimu/7ievhfC/puredolonewar.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/52b41a44f.pdfIn PDF document text
    • http://vinorama.fun/13565816495hpct2.pdfIn PDF document text
    • http://begetus11ppz.xyz/58899548468mxhfq.pdfIn PDF document text
    • https://dususujere.weebly.com/uploads/1/3/6/0/136024938/zotopunigedib.pdfIn PDF document text
    • http://tibetterrier.ru/29110940141gydva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_5ff671117a28c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_6001f5272451e.pdfIn PDF document text
    • http://ketosimple.online/kiwimajrau2u.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/tutinizibiponexusifek.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/8199725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5fe17f34f28a1.pdfIn PDF document text
    • http://jobauthor.online/nobaxikubegunofejajelupawxvgg.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/jvc_kd-s39_wattsz6jw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_60302ed79f876.pdfIn PDF document text
    • http://zespodsvetkoy.site/wallpaper_hd_for_mobile_carwph9o.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/bc2dc68a52fd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/10695028040.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/how_to_connect_brother_mfc-9330cdw_to_computer.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/siwumufasozon.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_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 5364 bytes
SHA-256: f39c6d8c32c6abbb694aa315c23b01dc143a4c91731b0599832b98fa9ba7aa4c
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 11476 bytes
SHA-256: ab8a51be01b41a9cdcdbf4eab4c39afe149295da820066097320981970aa2934

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