Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4386b5510509e0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-09 00:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a87faf79702ae94f0c2598f3905d5442 SHA-1: 70d8d39afff1fe2a12154c28275628fc30a9a229 SHA-256: 8a4386b5510509e0d8ffa9e5f58d71d080e1bed34ad97570f386bc8b06a16107
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to Excel graphs, likely to disguise the malicious intent of directing users to external URLs.

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://kuzutuzo.ru/strik?utm_term=how+to+put+data+table+in+excel+graph PDF link annotation
    • http://bilkan.fun/budweiser_logo_chair_conformationm4yrf.pdfIn PDF document text
    • http://select-get.top/kidenaveadpvz.pdfIn PDF document text
    • https://botabire.weebly.com/uploads/1/3/4/6/134629411/c8dfb286.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/guess_the_80s_game_answerszfc5s.pdfIn PDF document text
    • http://belkwigs.com/shark_steam_mop_manual_s3101a55mx.pdfIn PDF document text
    • http://getplafond.xyz/walaxuvudufatotisurezlduyu.pdfIn PDF document text
    • http://idealicaitaly.site/5844913842979g02.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/lancets_for_contour_next_ez.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/satejer_dozatarabu.pdfIn PDF document text
    • http://my-favshope.online/550416649450q2fh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padusij.onlinewebshop.net/do_you_need_maths_to_study_business_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab7ece5-2ad2-46c8-bf95-b3795e0b5ccc/my_samsung_dryer_wont_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f4bf91-8cc1-48d1-b2ba-f4f037f99ea7/safibumomapozidok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3e647b-6fdb-439d-a689-4d228e2af5ea/what_is_the_literal_meaning_of_hieroglyphic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a577c3-451b-4e93-a56f-c3e591bd253a/1999_harley_davidson_softail_service_manual.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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 5416 bytes
SHA-256: dceaa0237b1e3998a2a88c1f93c6249ac5435e9f0dce90fd3094a26936477e9d
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 11380 bytes
SHA-256: 21db8ecd55d4f1eed1bf7c706e87e67cb2c260504a836a5cf651874ff466a188

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