Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a484193dea66ad…

MALICIOUS

PDF

83.5 KB Created: 2021-05-16 09:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f71a3348c65324990d9ff82b67ddfd84 SHA-1: 447d9b97caf321fd33f54b1524f780762a94dd66 SHA-256: 26a484193dea66ad710377a23a8dd8ea61a08d759013a8f02ef3b707ceefc185
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a technique commonly used for SEO spam or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful 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://kuzutuzo.ru/strik?utm_term=simplifying+algebraic+expressions+fractions+worksheets+pdf PDF link annotation
    • http://select-get.top/kosipikovizijopizujajoretzx9s.pdfIn PDF document text
    • http://akmurzina.com/chick_fil_a_team_memberh2a2b.pdfIn PDF document text
    • http://expressday.online/when_should_i_plant_tomatoes_in_floridaaxqly.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/xumevemotod-keroborepo.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/583101907940go24.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/81054749901ict3j.pdfIn PDF document text
    • https://sujebufapu.weebly.com/uploads/1/3/1/3/131379792/daxinuwanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_601770bb996f6.pdfIn PDF document text
    • http://ejqy.com/felup1wlga.pdfIn PDF document text
    • http://prizinsta24.online/nikixuzuwxb4xe.pdfIn PDF document text
    • http://makamar.xyz/transformers_g1_autobot_cityg9ze9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_6019996014c5a.pdfIn PDF document text
    • http://nadahul.ru/poulan_pro_pr625y22rkp_owners_manual8nk9f.pdfIn PDF document text
    • http://avbox.org/28199753311y57pw.pdfIn PDF document text
    • http://itdiscounts.info/11156465507phasu.pdfIn PDF document text
    • http://azules.ru/2218192102ilrlc.pdfIn PDF document text
    • http://yildirimotobursa.com/had_better_should_ought_to_exercisepvui7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_dff28629d103483fb2db699a429592b5.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_559827994b5e41b6af3a1ee115a520a5.pdf?index=trueIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_0f87ceaf2fe5454eb13d46f79fe6a361.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 5928 bytes
SHA-256: 16db8e3acddebf8e7cf6d9ad8435fa1a430e6457be45483a9ef5c9dc59f84520
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 11252 bytes
SHA-256: cddeca3a69fdc158199ab973d45bd0f383511b20e3e60473500371b4527d988e
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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