Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97f6dbb97049983…

MALICIOUS

PDF

78.9 KB Created: 2021-03-31 18:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d18bd9e112667870263341c597ec69f6 SHA-1: c591c2dea8f60f967ab3c02e9a6900b9177762b9 SHA-256: c97f6dbb9704998383b728c503165ac5201a4a6f775fdefb55f8a1f590f1a1ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a search result lure. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=how+much+do+used+wii+consoles+sell+for PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451566/normal_600817e95c80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fd129da275f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6010712e8fe88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_603d031fa2946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_6029d5d5011ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_603a733817bd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454180/normal_5ff2029588029.pdfIn PDF document text
    • http://pomemaxevisuma.iblogger.org/80034506949.pdfIn PDF document text
    • http://gilezasewanima.iblogger.org/lesoxegolibuviwe.pdfIn PDF document text
    • http://mepanawabopod.22web.org/58453936743.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
    • http://mafasegu.epizy.com/sheets_of_wood_laminate.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/master_alternance_toulouse_informatique.pdfIn PDF document text
    • http://lifukifeja.epizy.com/answer_key_of_total_english_9.pdfIn PDF document text
    • http://wogulixa.epizy.com/marasmus_kwashiorkor_adalah.pdfIn PDF document text
    • http://zugosixefi.epizy.com/liwidizat.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/older_used_cars_for_sale_by_owner_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/why_do_i_start_fights_for_no_reason.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/95634857108.pdfIn PDF document text
    • http://varaxekewuveza.epizy.com/candidates_for_federal_election_canada_platforms.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/beowulf_online_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/draw_sheet_definition.pdfIn PDF document text
    • http://fufapawaxuta.rf.gd/linking_verb_worksheets_middle_school.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 4904 bytes
SHA-256: 8f593a884f784fd2560fd76af376770a5d811ead15c1fb1c1a52679f30ca0866
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 11120 bytes
SHA-256: e767aed4770317e860287d9b5460c67a2fad1c1d63611a461eb22c70ebd1e0b6
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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