Malicious PDF — malware analysis report

Static analysis result for SHA-256 10580604b443f374…

MALICIOUS

PDF

183.1 KB Created: 2021-04-01 20:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7eacfc1e4e6d3b5eedaed54388cd037f SHA-1: 49b97f2131d178dd161d22cff0f4b56ebbdffcd2 SHA-256: 10580604b443f37411909cdaecfece2968d9ff3e09466f50e4cb1cbc37677950
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one notable example being https://jacksth.ru/strik?utm_term=what+is+the+gothic+style+of+architecture, suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, further supporting a phishing or distribution scheme.

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://jacksth.ru/strik?utm_term=what+is+the+gothic+style+of+architecture PDF link annotation
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/7ebdeec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6037c58799a55.pdfIn PDF document text
    • http://milano-moda.space/flow_cytometric_immunophenotyping_fouftru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_603e6c867b60b.pdfIn PDF document text
    • http://milanbeach.fun/18451922303szlrw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5ffb6666e2a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_602beef886cc7.pdfIn PDF document text
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/9752dba89f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c814b09e916b43349273b8095ee6de31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2918130-8755-49f4-95ad-52dbdf591f0f/78424990429.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_2ea9ee15a35142778f20b6d21d30406e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/the_international_journal_of_applied_economics_and_finance_impact_factor.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_679349c4544d4f9693c53e9241bd5f79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ca86b4-d759-4c7e-ba2c-72eef92cd6d1/lobifomewojerazexofumipeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/difference_journalist_vs_reporter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536e41c6-8dc0-4cdb-9e1c-c183aef06ee7/rowenta_iron_repair_parts.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_1707761161ff439aa9ed9fb11fc1da80.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000292af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292AF 5256 bytes
SHA-256: eb31120e17daf9fd89aa83822a5f4ac6d553f07d105113baf1473c1012345406
font_01_sfnt_off0002a4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4A4 13784 bytes
SHA-256: c116e2dee203ffa438bd1b99967fedc8d8bf823519e700761231c7a5ea775de5

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