Malicious PDF — malware analysis report

Static analysis result for SHA-256 222f50e578f5aa27…

MALICIOUS

PDF

72.5 KB Created: 2021-06-10 08:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7b3cd15501a6d28eb3c7abe417aa852 SHA-1: 33d33487ffe97fc84fc87fb952ccf487bf8eef40 SHA-256: 222f50e578f5aa275e3927fcaa6138bffb5e57228f39c8d1447885145526f047
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method, and the presence of external URIs further supports the phishing lure.

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
  • 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://krisoc.ru/pbw?utm_term=the+definitive+guide+to+dax+2nd+pdf PDF link annotation
    • https://xakabitugaret.weebly.com/uploads/1/3/4/3/134366923/zitegofarudiw-kazuvosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_605fa89d51a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_600fe40405239.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421476/normal_60b60feef3fd8.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/c6840da75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_604a66ecdd09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_605f8a38a1b46.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/kapop_pebegeji.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/3cf9ad6d71fa.pdfIn PDF document text
    • https://pamoxoxose.weebly.com/uploads/1/3/4/6/134656592/1a15f6c107b.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/ff285190aa4991d.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/f32dd0d8-bb7c-4977-bf33-1b65075c1d97/55984144070.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144797415/85050835188.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425412/pavagada_solar_park.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ce8fa6-4c6a-45bc-beee-1630306294b0/pathfinder_2e_character_folio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b96fb9-3f8e-4047-9f0d-b0c00a849271/tiguvekuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdcdcb6-cacc-4ca6-a3a2-4a355fca9a8c/what_to_feed_a_sun_conure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29abcf2-8fe7-48a8-baa5-8b0679f01869/dd_planar_handbook_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05225a6-d078-4e3d-a77d-a7cbd28986da/soses.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5204 bytes
SHA-256: 4d30bbc2306325e31789cfb46f136621ab20281bcd1fc9797efdcd887a28875e
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10528 bytes
SHA-256: c0ad37704771a1c4a870c39cd948ddce3e9bade52157500de1d14557d904a922

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