Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6fc2c32f4c836d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-09 03:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e429c5f0b99204fb9b66024aaed98d9 SHA-1: edb1c60dfcfd5f04e5e7c58a9c83d531cf4ae68c SHA-256: ed6fc2c32f4c836d8f895e1e2722b10030eb1e105e05e76fab4abcf5df457909
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the 'wkhtmltopdf' tool, suggesting it might be a generated document used for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=festool+circular+saw+guide+rail In PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/kizizile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_601ecf7fdab34.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/cUgdhf6/download_ball_shooter_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5fed983c03aae.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/a3aefd.pdfIn PDF document text
    • https://mavobetana.weebly.com/uploads/1/3/4/4/134469330/nazikelurun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5ffe0ab93a1a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_6017b94c81773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381988/normal_5fef7dfaa2c89.pdfIn PDF document text
    • http://carinsusa.com/tegonoketejodavupagkht2i.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/Pjjiihc/25104629983.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/C0ie1up/king_s_throne_game_of_lust_wiki.pdfIn PDF document text
    • http://nikaold.site/attack_on_titan_live-action_movie_part_2_end_of_the_world_full_movie6hd09.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/2MMxjhs/defupukiriwejebe.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jgxgi98/super_adventure_box_skins.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jupoti/avatar_3d_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/nosevuseves.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/kezixiwagigamikewebit.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/84913381177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 4932 bytes
SHA-256: b4d3c27f278d5fadca8f5df54c39670a0f6a25583294f7c4402763bd728a4926
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 10628 bytes
SHA-256: aa7a71608bf256a162dd48f12e34ae4c500fac10f41d8bba40655a5c2d336ec6
font_02_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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