Malicious PDF — malware analysis report

Static analysis result for SHA-256 291bb970eaa0952c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 23:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b7dc4d338e401bda7a4eff443e795e0 SHA-1: 8ce0f4f4de56069117898a0c27aa0a35260f4e16 SHA-256: 291bb970eaa0952c29a408e085b57450d95d10abde840d0c3a81237f34c93ed1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/aws?utm_term=universal+methods+of+design+expanded+and+revised PDF link annotation
    • https://cdn.sqhk.co/xotosira/DjbdYf3/farozajize.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/buwafipajofasi.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/27838544471.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/logiduwipikadazi.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/bowflex_treadclimber_tc10_used_for_sale.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/1121882.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/endocrine_system_download.pdfIn PDF document text
    • http://asia.kiwi/noam_chomsky_child_language_acquisition_theorymbw4f.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/welefodofiwukotoloxez.pdfIn PDF document text
    • http://badgesverified.com/7947616270c889r.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/gesowapizufematidarume.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/6ca68e4dda65ce.pdfIn PDF document text
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/cc046fbbd5b4.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/77703715998.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/HlEhcgd/run_gun_banditos_mod_apk.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/1a15cd40-5013-4e81-904c-d3110e56e52e/91567507562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01c41eb-3b83-4131-bcef-78313faa17de/4691790764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8c68c0-b2c1-4000-8129-bfa08e6622d2/96342894885.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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5576 bytes
SHA-256: c7562b6bf67bd6762bb6660c5ab8857357d7acd44198360733493ecd8cb75bc8
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10996 bytes
SHA-256: bfe9c8b5a0eee7f5782a5c5a7a08029e3aa3f8a1c86273b67c25152d5e4e08b6

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