Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbf2d7e2974b7ad…

MALICIOUS

PDF

79.2 KB Created: 2021-04-14 03:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1c48206108f61eae4e0f14dd6ead21c SHA-1: 1a32e536fb2bec4ade0ebd31d2d59457ef4a1d5a SHA-256: ddbf2d7e2974b7ad618ff6c90133ec3e46ca24c4173dd4a1120d4b3373e3c4b7
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 designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=power+of+positive+thinking+quotes+pdf
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fe46a4f58da8.pdf
    • http://keep-travel.com/fanon_wretched_of_the_earth_analysis0zj58.pdf
    • http://womans30planet.com/dexuguvupuzolusukd98k9.pdf
    • http://dayzcommunity.info/94121779376c075v.pdf
    • https://cdn-cms.f-static.net/uploads/4385424/normal_60349cef0ddba.pdf
    • http://epaytds.xyz/42947834260zla6q.pdf
    • http://lnstagramcopyrigtservice.com/chamberlain_universal_keypad_not_working88wa9.pdf
    • https://cdn-cms.f-static.net/uploads/4480393/normal_6065c1b8dbde1.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6035e4c44a8fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_234608f38591441b8eaf3b42f572926f.pdf?index=true
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_b0f6f68dd46d44efb43e6ace3d445295.pdf?index=true
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_910929107a19419baa6bc147090dd5e6.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_509db570fafe44de8be1386f2eb1902c.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_67e1cc50902646aa842ed5599ba89061.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_673eaeaf9547419cb05ce67e35bfd788.pdf?index=true
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_afb7309de8b1402ca208ad6dca84fb44.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_3ff430a148d04eb2851f8e6915e8262e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea406c06-8de1-4611-b114-c04f394ab7e3/stihl_trimmer_gas_filter.pdf
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_38a59d6b4bb5474885a063f48eaf17d1.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_6d98680a9b18492b98612a83d981336f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8227e2b-1ae0-44f0-87a2-494a3e6c3872/37378624821.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_ea9304526a4642cc93b6282376fae89d.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_b11c7a781ca0491cb51dae85dd6a10a3.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_off0000f6e9.bin
dea1f8484f0edea3e593f420e6adcad5faa79d302a388904616647ca19911aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 5404 bytes
font_01_sfnt_off0001095d.bin
736bdfccd55e6565e57005cbb95b42fa60ab6d1ea680019f783d179fa85715ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11200 bytes

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