Malicious PDF — malware analysis report

Static analysis result for SHA-256 de38baa065bb559e…

MALICIOUS

PDF

75.1 KB Created: 2021-05-15 17:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62d748763a133b71e2fe3e37bd581ffe SHA-1: 72f5597a6f77a6011d0f569f951afbbe76554ca0 SHA-256: de38baa065bb559eb10ea184da6e584ddfb6230e21f9f6ad0b620eb5b3e931a9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One prominent URL, https://vilenefex.ru/strik?utm_term=sewing+machine+books+pdf, is likely part of a phishing or content-scraping scheme, attempting to lure users with a seemingly innocuous topic. No scripts were extracted, but the extensive link farm points to a tactic of driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-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/strik?utm_term=sewing+machine+books+pdf
    • http://jusibebobekig.iblogger.org/wobojimevimukida.pdf
    • http://zatutajijiti.getenjoyment.net/jimilusexuva.pdf
    • http://bodipok.getenjoyment.net/beveiligde_bewerken_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuzakifezara/words_to_describe_a_sunshine_person.pdf
    • https://uploads.strikinglycdn.com/files/35fa866c-93ae-4ae5-a45e-57a7f1687e36/25243516295.pdf
    • http://lavisekenesavof.myartsonline.com/wetozefokawetegoxuba.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_f0ed9b21060740efad9c93e6f85d4ff3.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_ae18c53368554888b3d3592adc7832ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e920a365-12a5-42ba-924b-36de307216ae/73354107806.pdf
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_86e048deaca945dd8e260b2ca0663c17.pdf?index=true
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_0bece77cca794e2db559cf00a230c6b3.pdf?index=true
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_6bc467f303ea45d6b5f4ace313f238e5.pdf?index=true
    • http://nogojituwizax.epizy.com/xanuvilajijetemutefuxi.pdf
    • https://s3.amazonaws.com/pesetufavo/albacore_tuna_price_per_kg.pdf
    • https://s3.amazonaws.com/bejenosugede/kaxexibexubudejuxo.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_e2d1d2b460184b3aa054e28fd654984e.pdf?index=true
    • https://s3.amazonaws.com/lulelepese/jijesevitobeg.pdf
    • https://uploads.strikinglycdn.com/files/f842da83-c4ad-4026-ab11-876655dc5cd9/zozupofamivikosam.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_8c1c056016c64e9986909adb13ec53f4.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_4761303301c849808f91bbc19ad4dd60.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_ef590b27ab7c466b82c06271b4407cd0.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_68b0852b9cb3465aade851959aee1aa6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e629.bin
3e0892f30381c6a6442cb00c72d3e7974ca950a7d0bc9b50c18963779e508caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5840 bytes
font_01_sfnt_off0000f9f9.bin
4b7a3e1514e6bd02f96af78a609d9c295a86c9fc84d6e018964311365d99f6b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10444 bytes

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