Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b561f8f3f72111…

MALICIOUS

PDF

81.7 KB Created: 2021-03-18 17:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2d6ff709d4df51030d90af976fa4562f SHA-1: 2d6e50667f5111108386e8b94f6abb32c778b3ed SHA-256: 74b561f8f3f72111f3a1b1a9b1a70c7f7dea7ed4f17e299509c3adff5a29dda3
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 a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=2010+lexus+es+350+wheel+size PDF link annotation
    • http://nekuwagibajese.getenjoyment.net/attack_on_titan_2_gameplay_android.pdfIn PDF document text
    • http://habirovradik.ru/94138483054mmmpx.pdfIn PDF document text
    • http://mebets.xyz/la_catedral_del_mar_habra_segunda_temporadannzli.pdfIn PDF document text
    • http://discount50it.pro/remington_pg6025_manualtkla8.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/book_of_hosea_bible_study_kjv.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/tegijokafowawdcx7a.pdfIn PDF document text
    • http://lnstagram-helping.live/cyberlink_youcam_7_free_download_full_version_with_crackwqa1g.pdfIn PDF document text
    • http://meetly.space/washer_and_dryer_repair_green_bay_wiw8zl1.pdfIn PDF document text
    • http://liketsven.xyz/dalukewojencnsp.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/aleppo_codex_in_english.pdfIn PDF document text
    • http://letnesil.xyz/alesis_dm10_mkii_pro_vs_studioldctf.pdfIn PDF document text
    • http://azakalaza5.xyz/what_were_the_major_patterns_of_native_american_lifeg93c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuragumok.atwebpages.com/99845390262.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/40452623071.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_231d9e90137548799dff6c8cad20e3a7.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_6ae4e37d2bcb4c2892ce3fa731f9ab56.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_91a707eae2534fd9ab5b0af1bba7df14.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_a0853f8a03934bcbbba7ee88fdc684b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefadep/tewemixegomemezu.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_4b014894dc9c48af921aee5067493873.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/32582186513.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/96508500401.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_1c42a22495ea4942a23d52fc303034df.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_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 5196 bytes
SHA-256: 10487f08dd707bd24d1565d6806a44938504a316c179a979c6bda59d0199ba24
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 11024 bytes
SHA-256: 3969ba0aad4a07e3b45b0b2dec912bea6e7b84d872b2b9a2de4d65f34bc4ea1a

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