Malicious PDF — malware analysis report

Static analysis result for SHA-256 9270a905e5a6344d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 21:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf2ca58de50bb9f5195623ab971900c2 SHA-1: 1a5c8773d6b5502eb907d81df47ec025285dad58 SHA-256: 9270a905e5a6344d6e31536e8bbe461cdfbed13fc2c03352eabd15e3479e9da3
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous links points to an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sfipl.in/userfiles/file/85837637679.pdf In PDF document text
    • http://cnmrobotics.com/files/files/33513139204.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/58124948674.pdfIn PDF document text
    • https://phukienbep.net/media/files/bugexunojizigisuge.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/70718927302.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/zabumariviparogutiw.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gopelalu.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/77319093915.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/3325518363.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/25729611136.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/25788402490.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/26586990116.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/88893459392.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/feruji.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/80695554919.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444d87a8f1---8609326787.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/46084018298.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/rojanapijufopezuferop.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dodeduxolomadutagolilebas.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c699a1c11521527e7d7632b88e24ec31/94975664786.pdfIn PDF document text
    • http://wsm.hk/images/files/36430361881.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazobuweru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=last+day+on+earth+survival+mod+ultimatePDF 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17124 bytes
SHA-256: 8a8748927f637039415c2cd03b6bec7ae47c233b38ac1dd0b7668200343872b0
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 10752 bytes
SHA-256: a5c1b13afe66dea553aa5c138ada7425d99a6608b58be905f9af97ea28528cc4

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