Malicious PDF — malware analysis report

Static analysis result for SHA-256 405536f6bb91a7b5…

MALICIOUS

PDF

86.2 KB Created: 2021-03-16 23:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203bfab16ada79f7b58978cb74b5d941 SHA-1: 08019cddc2322977aacdcad7aba8a58c2a0ca4eb SHA-256: 405536f6bb91a7b59885065fe7fae7b3a4eaad4ad0346b2f9049c9b8f20c7cf9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=backlinko+seo+guide+2019
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/degojejun-denolefudili-najarajut-fumisitirokofe.pdf
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/kijozetezijis-gikovazo.pdf
    • https://cdn-cms.f-static.net/uploads/4478926/normal_604834119146f.pdf
    • https://cdn-cms.f-static.net/uploads/4383582/normal_600aa68001f1b.pdf
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/b14ab52d6ca04.pdf
    • https://cdn-cms.f-static.net/uploads/4408593/normal_601c95a6dc00c.pdf
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/mexigasam.pdf
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/rigabo-zuwos-xoxarow-pekifiwodu.pdf
    • https://filokizufotol.weebly.com/uploads/1/3/4/4/134455434/fff3d5a539f9.pdf
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/kolewadej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_61ddc9dd685f406598a7d392efa443f6.pdf?index=true
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_45e391ee1ffa43e3b153be19f8ba02a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ade567d3-2c71-453f-a1e3-208a36c572f1/monster_vs_aliens_cartoon_characters.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_ce1005c94d3640afbf4f08219242cde1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/473b33f7-2c98-4ca7-91da-252172a018f5/46486485512.pdf
    • https://uploads.strikinglycdn.com/files/866d03ef-ac15-488c-be70-c138f519f801/savobupimivetid.pdf
    • https://uploads.strikinglycdn.com/files/cef368fc-6c69-461d-b729-404cd508db2b/what_does_not_equipped_with_uconnect_phone_mean.pdf
    • https://uploads.strikinglycdn.com/files/3f2b077f-cc78-46f8-a772-12e6f50c43e4/how_to_install_autocad_free_trial.pdf
    • https://uploads.strikinglycdn.com/files/289b7f52-9285-498b-8ea8-1ed8bad130d8/intermec_pm4i_not_printing.pdf
    • https://uploads.strikinglycdn.com/files/6032d57c-ec45-4993-83b0-7549859a75c7/bible_handbook_stephen_haskell.pdf
    • https://uploads.strikinglycdn.com/files/880bee97-f9fb-448f-a72d-58cfe0c359aa/how_to_setup_audio_out_on_samsung_tv.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_7fb3f7d8c12144e29085da0fe0847e66.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010949.bin
3e6fabf514aa8013ad62d886c27db4c7e76b6161ce8cd2f5bd6996e18c2c8643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 5604 bytes
font_01_sfnt_off00011c69.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 1800 bytes
font_02_sfnt_off000124f7.bin
355b85b89ef1d5f78bfddd319caf9953f67dbee7361c22b9b0213c642177d053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 11240 bytes

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