Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fd37ea0ea9d9ed…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 732f3f0d4b9ab9e46101c893fcf15b13 SHA-1: 4042a86639f1da3000fa6e06353a50d5e3c8341c SHA-256: f4fd37ea0ea9d9ed5d3673fb21281ab8f65e7ebb1a7e55c578f7ae0676961caa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content. The PDF structure and the presence of multiple external URIs suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://americansemitruckparts.com/d/files/75413042542.pdf In PDF document text
    • https://ksboutlet.com/file/files/rarisuxanufiwugosirumex.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sinurozovesi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///12430519916.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fatobojavixozi.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pifumomevaz.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vamufuzefezemamijutix.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/94716594499.pdfIn PDF document text
    • https://mollis.rs/files/xugetesonulozaruti.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/mevizizuwivokomawoka.pdfIn PDF document text
    • https://arendic.cl/files/25908440668.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/4484647941.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/sonukovu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/93714031456.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/55350534647.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb023cbc8---rikamuzore.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614039fb48260---sosisexavegamubojibo.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/videnuxenutifatoxedutip.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kiwatafazuxibadov.pdfIn PDF document text
    • http://keitbg.com/images/files/9887776064.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/13901356060.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/sepuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=80+inch+tv+price+in+pakistanPDF 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 18044 bytes
SHA-256: 1761d00aa5e6857573c05c3a8f6d1de8262cfda832dc7805878a922af4ee5d9d
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 10696 bytes
SHA-256: b446ba771258765334be841767533450d34bdfa9a4b53175a871add12b6e8846

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