Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60d47bddbde679d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 11:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2bd0730ae455aea03e23a0022b1a1ddc SHA-1: 9be53a1f0d3208bda534c57b0fc806c3d53f2da4 SHA-256: d60d47bddbde679dd5a88f594fe657541fa7245c800455831fede83d1dd44983
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, including one pointing to 'mezovuduw.ru' which is associated with a 'how to reset tamper alarm' keyword, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, further supporting a phishing or malicious redirection scheme. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

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://mezovuduw.ru/wb?keyword=how%20to%20reset%20tamper%20alarm PDF link annotation
    • http://nufemewi.iblogger.org/ata_guidelines_pregnancy_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_601af23fcf7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fe9fdfa06466.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/jgChhia/87905322909.pdfIn PDF document text
    • http://itravelimpressions.com/food_delivery_jobs_like_uber_eatsryivu.pdfIn PDF document text
    • https://cdn.sqhk.co/sejaganetaxa/jvmia7j/51223170463.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/cNKgdje/strikemaster_ice_auger_carburetor.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/hhcjOVr/46977697800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6033e60122e22.pdfIn PDF document text
    • http://alexsaf.ru/how_to_fix_a_hunter_fan_remotetjldy.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/gtA49hw/26307151667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fda722eeff32.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/hhxEjhM/74189644669.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/jdjgXGh/que_es_virosis_en_ingles_presente_progresivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaramapowo.rf.gd/puzzle_of_the_week_85_answer.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/jitapeduf.pdfIn PDF document text
    • http://tikuvusupatel.rf.gd/how_can_we_have_free_will_and_predestination.pdfIn PDF document text
    • http://jojerigexorow.epizy.com/how_to_change_blades_on_honda_mower.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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 5016 bytes
SHA-256: 0d00748881493a6f68718c0a03c1e0fb21a973e38d9dc702f3ed8d93aa3b1820
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 10636 bytes
SHA-256: 7e09ac3745c5a9dc919220a99a6f7b9af14cfbe76231490784afa9002bc2689e

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