Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12b11d15cce0dc1…

MALICIOUS

PDF

81.3 KB Created: 2021-05-10 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0aa1918413cc977e5a09afdb3524c2 SHA-1: 426d8cbf05e74054463706b5024d2aa6a6ea49b9 SHA-256: f12b11d15cce0dc1e5294e04752344e836b03d1d46f878cf7f9637929f1ba03f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a tactic often used for SEO poisoning or phishing. One prominent URL, 'https://seumenha.ru/strik?utm_term=what+is+sensory+words', appears to be the primary lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, contains text related to the lure, and the presence of embedded PDF links suggests an attempt to direct the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+is+sensory+words
    • https://cdn.sqhk.co/gogojelawov/NhhEYjj/gas_prices_in_california_april_2019.pdf
    • https://cdn.sqhk.co/segidexu/tUCYjiY/tuwubizetape.pdf
    • https://cdn.sqhk.co/letonolomo/jhcibif/zombie_evil_mod_apk.pdf
    • https://cdn.sqhk.co/dolafita/6uf9heE/cut_the_cake_song.pdf
    • https://cdn.sqhk.co/xojelumegasi/3Ohajdg/vabom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/996f2b44-6ccf-4bd1-b640-61290e9bced9/dizerisowegogefikizaz.pdf
    • https://uploads.strikinglycdn.com/files/18dfbe97-7964-4ffa-9a1d-1225635ceea8/rinilavanixesa.pdf
    • https://uploads.strikinglycdn.com/files/9d7ec994-802a-4e11-9697-30cc962f9b1c/throne_of_glass_series_order_to_read.pdf
    • https://s3.amazonaws.com/paropabaru/someone_like_you_paolo_nutini_chords_ukulele.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_45452037d3934042a4f85811f9a2ddb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a832608c-df83-47ce-94a9-bfab956c7419/8278684061.pdf
    • https://uploads.strikinglycdn.com/files/e8c4a806-bd6d-4999-9c9d-8df8537e379f/4489488665.pdf
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_6a8cc0d57ad44ce68fdda6631f856004.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ed258d9-30b2-4ef0-a5c3-3ccd964d8d69/metal_gear_solid_2_substance_pcsx2.pdf
    • https://uploads.strikinglycdn.com/files/9efb5558-50a1-45e3-a61a-63fa5aa8ca63/28988922374.pdf
    • https://uploads.strikinglycdn.com/files/4e2be87e-428f-4fe1-a5aa-5ad7f2b31775/rulawonezasitajirofurup.pdf
    • https://s3.amazonaws.com/labitajaxatufib/52768404850.pdf
    • http://ridudexubarite.epizy.com/windows_10_free_download_2019_iso.pdf
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_2e33268bd40347dc87124d7eb2ceadf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b42d37d7-9bd3-417d-94b3-382c9d2952eb/sugavaruzewezisaduwip.pdf
    • http://bopagit.rf.gd/zuwonudasuxevibetas.pdf
    • https://cb5a1bef-7d05-4463-9361-9dceb4a497f4.filesusr.com/ugd/b13fd1_251241a9d73646c89da6c27840702d4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1efa86e4-3481-4738-adac-d8ac9de48df6/jaluvusofubewasafonemitak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023f.bin
ab017a3c99d42396d7dbbb407e5a3e07d190922f3d7a6ee74be2c631b890dfaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 5088 bytes
font_01_sfnt_off000113a0.bin
cf5f81b02b4874216609eb2f4a1d8d7811c6934ce6afe909d1286938fb99c715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10596 bytes

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