Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cc687905a47fb9…

MALICIOUS

PDF

85.8 KB Created: 2021-03-18 16:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4096c1bcc5b356dd5b64d21f71aed7a9 SHA-1: 5ae23ffd5c8b4f3d961108d2691ead231c3d1884 SHA-256: 57cc687905a47fb9f99ae65129bd54cc6f91b3694068d528b6cfc353c13cbdce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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/award?keyword=arbol+genealogico+en+ingles+ejercicios+pdf PDF link annotation
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/kagapumizakew.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/bafuked-bigopa-pilisodibi.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/majataf_zobaguduv_zaxixifiwinozab_solojijudonu.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/cji6ODA/air_jordan_1_union_real_vs_fake.pdfIn PDF document text
    • http://padujosa.22web.org/converting_between_units_of_measure_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fd24287b7681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_60152c0c87c80.pdfIn PDF document text
    • https://cdn.sqhk.co/gedadixugud/nXiggjU/lozuwemepatato.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/mHVgfCl/video_player_download_for_windows_xp.pdfIn PDF document text
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/144318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_604705b75e803.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/pgfifFy/funny_supernatural_memes_gifs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_603c0481496f1.pdfIn PDF document text
    • http://fisefer.22web.org/why_did_italy_ally_with_germany.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_603e2953d651a.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/id0gfgc/92176196855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b979ed4-1d7d-498c-9e23-091145c8a277/lugejomifate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5950d76-e83c-4dcf-bfd7-bd0ca0c6210a/farubaxirunujuniviv.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_2c53c75288464a02978d03d787bd1524.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_8a108ab4d52c4d3587b6848b6cbda696.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_bc936f95ea2043869cad28df73ebf82d.pdf?index=trueIn PDF document text
    • http://repewuwutopin.rf.gd/after_party_game_platforms.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_4353e092aecf4b68a4f5d59f2fc50d8d.pdf?index=trueIn PDF document text
    • http://gaxodisesi.rf.gd/22502872006.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_edcb36e81a124350b124f6fe1d9a314a.pdf?index=trueIn PDF document text
    • http://jodafenokod.epizy.com/mammoth_lakes_snow_report_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e8f645-0490-4658-910e-38fe18b710ed/present_simple_exercises_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f884efca-a860-416e-bba7-af567336475b/a_history_of_the_world_in_6_glasses_coke_summary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5528 bytes
SHA-256: fe8d08426b0ac7828aebcd8ad3868a7a4147a3aea10bc8fca7b37e3fd94a23a3
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 12144 bytes
SHA-256: 2d07337f8efa9f50a22220c4e292fffa5b5e2c0d81f7bbb79d2a48c43bf75dc2
font_02_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd