Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37526e01cab2dc0…

MALICIOUS

PDF

87.8 KB Created: 2021-04-07 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41a0df90ef663d33327dfe6d5bc67e1b SHA-1: 9297b3f7eb725c016c7d973e1d276fc43f633645 SHA-256: e37526e01cab2dc0aa11f197c677fed780949fcb21a165a489dc618b804b87cb
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://xajibur.ru/strik?utm_term=kali+linux+nethunter+devices PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://simipibenafar.epizy.com/jisobipikijaxagereza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b61eab-bc4d-496f-9a39-fb82f3fc96bf/showtime_rotisserie_turkey_recipes.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_dcf015a201444588936e9f101dc2631a.pdf?index=trueIn PDF document text
    • http://tofalit.myartsonline.com/formulaire_declaration_de_cession_vehicule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd358f99-83e0-4349-af81-9dd728bf463a/billie_eilish_the_end_of_the_world_lyrics_traduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186e41a4-1301-4a25-9502-4867b54c3a0c/hp_laserjet_pro_400.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_93a551385a434734a61f5c1c0e1c9325.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7425dbe7-7da1-406c-b4fb-9566630c5f22/les_miserables_original_london_cast_recording.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_0559270b620148bf8d2f900b72a5cfd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e32761-d56c-417c-8ee7-5730233d78b3/nonton_film_fifty_shades_of_grey_darker_sub_indo.pdfIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_a436278276a64e9d96575329cb3121c9.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_e3f4af5e61de4c92946494e5569fe584.pdf?index=trueIn 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_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 5124 bytes
SHA-256: 0e4e16fb74d44f316ad47c74166dae2c47f1a37f3f6a48c299ed5129da98e828
font_01_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 10992 bytes
SHA-256: f4d17edcae85d404f5773f6b1c585e6e9867567e625a95902f929b60b44950a3

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