Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9171458c12c02eb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 20:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66c584d3e5a0a59bd216e4bbeb04dd62 SHA-1: 9a7550a2e22156e9317a8dc8c7e84a06e5e2dc01 SHA-256: f9171458c12c02ebb6d5d4663f6a65ddb06a74829c0a40905cf21d592244d4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=windows+store+android
    • http://globomax.eu/userfiles/file/22266642015.pdf
    • https://arhometutor.com/userfiles/file/81922304476.pdf
    • https://sealskinz.ru/files/file/23036538930.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc73a2f87---8300781501.pdf
    • https://avigailpekelman.com/sites/default/files/file/1215761576.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/muwukovixikewan.pdf
    • http://ptktent.ru/userfiles/file/visowozav.pdf
    • https://brs.jo/userfiles/files/94276603959.pdf
    • http://konferencii.org/web/uploads/assets/file/valen.pdf
    • http://vamaconsulting.sk/userfiles/file/14815505636.pdf
    • http://boston.pl/fck_pliki/file/25545160879.pdf
    • http://lpxs168.com/filespath/files/20210902123845.pdf
    • http://qualityspices.in/ckuploads/files/limetub.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vidomamifiwi.pdf
    • https://forumsevens.com/images/file/tanokope.pdf
    • http://abwpetersburg.com/uploads/files/18167451810.pdf
    • http://www.jokilaaksonratsastajat.fi/file/91607000656.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/6486848309.pdf
    • http://i-dron.cz/data/file/nejixululilumuninuku.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/titavid.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/dazefodafi.pdf
    • http://lachambredechos.com/userfiles/file/41623568787.pdf
    • https://mashtalkandil.com/userfiles/file/66358031823.pdf
    • https://gadapavimenti.com/GadaFiles/file/purojamotusopidemek.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b094.bin
ba9c24c42d4d3a1c2d960c7eee407472819db265e00c5edfa5131641853e620e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB094 17304 bytes
font_01_sfnt_off0000dc76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16792 bytes
font_02_sfnt_off0000f48d.bin
0f001ebb19f83b18afe899c3d2d76ac8721001774e6119928e4f710cfc1b2084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10272 bytes

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