Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b36ca836163673…

MALICIOUS

PDF

82.5 KB Created: 2021-04-24 04:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 927c0e4338e0a0fb15f162cce74f9b17 SHA-1: 220b059e45b3588e52ded92a9dc9929683e9b998 SHA-256: 94b36ca83616367315a896e2b5622d2c09a2fad5f8587a808a508513e3fb144d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL `https://mezovuduw.ru/strik?utm_term=2012+hyundai+sonata+hybrid+engine+removal` further supports the phishing lure by mimicking a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=2012+hyundai+sonata+hybrid+engine+removal PDF link annotation
    • https://cdn.sqhk.co/bapinero/idADVIE/76273446451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_6026f4b21d990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_601e81262d36b.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/gujiijS/44564728965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_602c15ceea7e1.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/f283d9e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_602acf51846a8.pdfIn PDF document text
    • https://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/11065300b45f9e.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/nerirokuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/diehiha/zujakobexolubidibopuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_69def59b2025448ab2827db7023027cc.pdf?index=trueIn PDF document text
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_0a64521842434a3a8a6f92db824263f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b345d96-6537-48da-852d-435bf965bb39/the_narrative_of_the_life_of_frederick_douglass_quizlet.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_60ad523e5f4e455f8b8a5f2255eb7406.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/100e014f-8466-43da-aa9d-f15155066ad4/phantom_of_the_opera_scenes_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2460624-35e3-4cb5-ae92-644f8f7ce0c9/washington_dc_hotels_with_indoor_pools_and_free_parking.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_d1ab17907f7f4e2588344f33360c7a0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9ded50-fa9a-4dbe-a290-f3f9bf9ee18f/taylor_biggest_loser_scale_manual.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_569d1d6673e34dcdae3310566a094aa7.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_f27f76f3ce4e49e388937674bcb03d84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1ad17c-b8f9-450e-8d8d-70febf487b33/40597891199.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_c012123d19d94d86b5ca0429b8b7c75d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 5772 bytes
SHA-256: 30d1b9ff7bead107d80661c1cc3efedfd40fa11d0a87dd6c2857c15e886e2c9e
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 10676 bytes
SHA-256: 2051da49b0a09af41406ad32d43fda261e5902411203dd0c69e0b31500fcae8c
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501