Malicious PDF — malware analysis report

Static analysis result for SHA-256 026a8d578bd7e08b…

MALICIOUS

PDF

77.0 KB Created: 2021-05-16 15:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73722c2990611bac0953e4de5c11a152 SHA-1: 3680d10edbb3f5b29029e7500c630dc1991321cb SHA-256: 026a8d578bd7e08bac4c92d10591c0fd5270cf569869a7fb3cc464595988e20e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=what+are+the+vision+requirements+for+cdl
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/1711573.pdf
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/somoziv_xilajezomite.pdf
    • http://bimatixazokepox.22web.org/biographical_dictionary_of_film.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xufizup.rf.gd/ardaas_full_movie_hd_1080p.pdf
    • http://zuwarevozaraxa.rf.gd/79704500012.pdf
    • http://xuwajapu.rf.gd/74139532562.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_5a4a2c7903c64119b07f5ec14e3bbd1f.pdf?index=true
    • http://xulodolab.epizy.com/47292262199.pdf
    • http://bafilus.epizy.com/vintage_badge_free_vector.pdf
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_0b7b670a603f400c95b07f20bb2bfa7c.pdf?index=true
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_16c49299167f4dcf9a8b23e884c8389c.pdf?index=true
    • http://fezurerejexi.rf.gd/what_is_the_coldest_place_to_live_in_the_united_states.pdf
    • http://lugetobuzisufa.rf.gd/71857467344.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_8bf80ebc32b24945a7ff82f749a04ebf.pdf?index=true
    • http://folapopapewoxa.rf.gd/remington_700_sps_varmint_stock_upgrade.pdf
    • http://zaguvigijosev.epizy.com/fibufiduzesakerimazoteko.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef56.bin
24b3932756b57cd4732ac1b10ef96ce941c43b3dd7dba0f0c94fc8b45b5b70d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5460 bytes
font_01_sfnt_off000101cd.bin
837c7d6dd8aa9ca960f63ee37e4a98bb0a78b980b4e8188798b2eb3a7d0b7071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 11104 bytes

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