Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cfe3ddd3427b8f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 02:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f5e65afec9ad22da9170956fb06d47f SHA-1: 5eb9e0fd95c0857210d62fcda445d65186eaeb44 SHA-256: d9cfe3ddd3427b8f090d68caf0ea5bbdaa68df3a372b64e9e3bb7a5d8c974d62
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://dafemum.ru/award?keyword=cornerstone+piano+chords+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486566/normal_6056531ed2990.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/71507361846.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/cf9fshe/90360749661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_60322a8a90cf1.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/gcamZMH/tips_for_gang_beasts_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5ffba1f1ec02e.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/ihii3UC/xewovopalok.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/gcfgjjc/gluten_free_pastry_recipe_with_self_raising_flour.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/what_does_straw_man_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/fghUGgj/mojegaki.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/ieCtgiV/show_me_funny_pictures_of_dogs_and_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jLLij7r/srso4_state_of_matter.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/franchising_management.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/fakikodatufugik.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/OigZaid/oneplus_care_app_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_604cccfa36c06.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/3hamig6/make_server_minecraft_pe_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rizanatu/hcgjhd6/amazeballs_recipe_eat_fat_be_thin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_601b83cc62983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_5d26a1e6d6124c29b904995de525ed33.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_7809ecb46f79460e89566f1e0590cf35.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_22067416fed5477a8eabc2386ef18142.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/ultrastructure_de_la_cellule_vgtale.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_852b0d267b2342afa447002cc9155725.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_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 5116 bytes
SHA-256: 659977cc16acffa7bccc85d26333c8454cf98da8103d76a558a6fba45a1ce1a0
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 11300 bytes
SHA-256: c77145d5dbcdaa6f130a40c0140bebd683f2e7bc75f712dc7fec665a3589bb27