Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ce649572cd636…

MALICIOUS

PDF

90.3 KB Created: 2021-03-18 20:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec75cad9beb1f7d58e754e0cb076e46 SHA-1: 9630c0dcd1ffecc82253d329eaade21a05f4170c SHA-256: f54ce649572cd636d5be8a7adb52dbfd9320d0d8f4f7ea12df0b234208e3c38e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links, one of which is a malicious URL. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that aligns with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=crumbly+cakes+f5+answer
    • https://cdn.sqhk.co/reriwoduriju/hUCgigi/we_love_you_printable_coloring_pages.pdf
    • https://cdn-cms.f-static.net/uploads/4459060/normal_6050d51a0a2de.pdf
    • https://cdn.sqhk.co/buzomesil/gf2yPrF/saximelamezite.pdf
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/2731045.pdf
    • https://bekefopu.weebly.com/uploads/1/3/4/6/134692172/wezowopexikomemalo.pdf
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/xafabojeratak-kilixejozovi-niguko.pdf
    • https://cdn.sqhk.co/xakelafu/hfjajhm/cheran_pandiyan_comedy.pdf
    • https://cdn.sqhk.co/wekaradukuve/fgdidgj/habbo_retro_logo_maker.pdf
    • https://static.s123-cdn-static.com/uploads/4392652/normal_5fce321d03819.pdf
    • https://vaxamapex.weebly.com/uploads/1/3/4/0/134017084/gimilevivuwamafot.pdf
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6011e3104c3ff.pdf
    • https://cdn.sqhk.co/dexediwiboze/hhdjbB7/54176403668.pdf
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/4605808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25caf20c-f666-4062-8726-650d5793c412/how_to_get_into_bios_lenovo_g50.pdf
    • https://s3.amazonaws.com/garorowa/dugewidufiru.pdf
    • https://uploads.strikinglycdn.com/files/f8f26aca-a80f-47f6-9970-1d95e9a1f6e8/87446362551.pdf
    • https://s3.amazonaws.com/jeromisixinolib/what_kind_of_oil_goes_in_a_simpson_pressure_washer.pdf
    • https://uploads.strikinglycdn.com/files/b104862a-28fc-4bd7-bff2-ef55602dc173/mapigafugij.pdf
    • https://uploads.strikinglycdn.com/files/5c87d412-69da-413c-a084-b90980ad6aea/pafun.pdf
    • https://s3.amazonaws.com/fakuguvil/workflow_chart_template_word.pdf
    • https://s3.amazonaws.com/wetevali/gmat_official_guide_2015_free.pdf
    • https://uploads.strikinglycdn.com/files/1288b4e9-b380-48e2-a117-a24e56e79d98/pexafasozetemetuwojilix.pdf
    • https://uploads.strikinglycdn.com/files/e5e6fd6e-e4e7-4ac1-9a17-8d9abc26e0bb/xitajewinanogagabufopuw.pdf
    • https://uploads.strikinglycdn.com/files/2a07b96a-d6a6-427e-a9f5-cecdf3ae4c54/how_to_buy_a_rainbow_vacuum_cleaner.pdf
    • https://s3.amazonaws.com/tojabixefova/the_productivity_project_book_download.pdf
    • https://uploads.strikinglycdn.com/files/8b69afa8-5a98-4a74-8c12-46f6bb0eb0e4/93090998640.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_off00012070.bin
f47042adee0d10b9b40d69760888dd79acd0d902215199d7aafb3e78deaa1d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 5452 bytes
font_01_sfnt_off00013302.bin
53c6e35df38380cd70dbac0f48fe3c8dfdbfac7204f206986c0fda251f3f0ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 11396 bytes

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