Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d271046e504551…

MALICIOUS

PDF

82.7 KB Created: 2021-03-19 18:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c807ea873a0be7d54b6b2cdead5b5921 SHA-1: 8450038dc5a06a024f171b932f4ab16927a0ddea SHA-256: 18d271046e504551be9ebabf744e532f7e2bbe2811f81ed9f13366549d9946c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://vilenefex.ru/wix?keyword=triangle+shirtwaist+fire+worksheet+pdf
    • http://movizopolu.medianewsonline.com/97825081660.pdf
    • http://sezejawi.mypressonline.com/third_abcd_letters.pdf
    • https://cdn.sqhk.co/lazodadevab/YuXjiO4/kufedekelujuwuw.pdf
    • https://cdn.sqhk.co/zesozote/Mjjegj0/scribble_rider_mod_game_download.pdf
    • http://jejederepox.medianewsonline.com/gabungkan_file_jadi_satu.pdf
    • http://magic-world.site/brothers_movie_in_telugu_songsscev3.pdf
    • http://tekplafond.xyz/paint_sprayer_rental_medfordb82wm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0aed015b-fe12-4f32-95f7-081a37859f3b/6024383536.pdf
    • http://diwiludoki.rf.gd/94545561763.pdf
    • https://uploads.strikinglycdn.com/files/a9e2fb68-435c-4d01-aa50-0a5456b03ce0/safurolix.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_a141c7e128e543c083a4c3d1c21a1c03.pdf?index=true
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_3b9c0f3e7a0d4782b81f7f238cd3cfbe.pdf?index=true
    • http://juzujodajemafa.rf.gd/94657284474.pdf
    • https://uploads.strikinglycdn.com/files/1395781d-a32c-43bf-9c17-44f4ae700be6/elm327_interface_bluetooth_manual.pdf
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_bbf62ba77ea84a2285c386ca80ee100c.pdf?index=true
    • http://legokejapo.atwebpages.com/thomas_merton_prayer_of_surrender.pdf
    • http://kudetewususitup.rf.gd/22554450452.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 6744 bytes
font_01_sfnt_off000103dc.bin
957ebaf81ec7fb41830d73ddd6385bc5229c176fd8459bed3219da7946f5bc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 5408 bytes
font_02_sfnt_off0001164e.bin
3204258ac1e7915a1638a79e30d67a2d47de732a1492d14edd78a08813853ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 11540 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.