Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9a5e9a4761f6d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 11:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3897bc57d7ac7ddbf8f96686c3de469 SHA-1: 58708039dad9f131d2201d66e9c9238cc5946373 SHA-256: c9a9a5e9a4761f6d56e3ec6007cbfd721051f6e07f17f5abc4b343e02b1e5833
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm. The document body is unreadable, but the heuristics and URLs point to a deceptive scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://pevak.info/UserFiles/File/42428338360.pdf In PDF document text
    • http://onelove.cz/file/41615197560.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/lolufimopulomevisewo.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vawolexezosuvutorov.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/40267991706.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/zerefadiju.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/zulikofuxeto.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sisagotok.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/buxojipuveb.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nanuba.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/mewemepubusesepifono.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/fakaju.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/38385097958.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/5275999009.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ab437fe9---18898837633.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zarexi.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99334106580.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kavoli.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/bomofigifawowem.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/9673759221.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/11517926165.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kegilejebinodubegu.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/koniled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gloud+mod+apk+unlimited+timePDF link annotation
    • 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://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_off0000c34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 10516 bytes
SHA-256: a1dd9e0e2e68666c86cca628fd6152454e30bbe3e4eb8eaf869327cee5844598
font_02_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 17320 bytes
SHA-256: 6a6d4d9b433ccfb56bcfb5db225baa7eda33b02ae527471706370145474e8321

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