Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a89efd092b5115…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 14:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8cd68c5cf6fa353262896791870fe40b SHA-1: 2e096f1b79fc8c41142ce5fc88854b4969867d0c SHA-256: d7a89efd092b5115cd3655a2810252cfc71b4f0e471b69f459c82b647143b122
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 pointing to disposable domains, indicating it is part of a link farm or SEO scam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=ethics+theory+and+contemporary+issues+9th+edition+ebook PDF link annotation
    • https://cdn.sqhk.co/wanadujogo/r4XXigD/developing_strategic_thinking_in_business_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/hOngdqG/hill_racing_pvp_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/gijXjdu/zodijixofoxumaluvatu.pdfIn PDF document text
    • http://depusapo.mypressonline.com/bundesliga_schedule.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/navagidoxitirarawinitek.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/ggnXVji/cbs_sports_franchise_football_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/madusivesuruwuwu.pdfIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_58a3bec07cd047f9b21abdf3743983df.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_01fae75dd49a4e6cb9fa27487a75c599.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_c9fe8a58ca614c48b23695f514a49c56.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_a77ff72f32894474ab593c926df47741.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a8e5649c082246e0a8f63c199375841d.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/vapavoxolofokav.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_c2c5c4cf42c84afbac9009aa77ae272d.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_a0fd8647fc5347608f93f53319cb5edf.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_7868d4f135424831a4976487e8c4ed20.pdf?index=trueIn PDF document text
    • http://felugibesixe.onlinewebshop.net/literacy_progressions.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/duxejegelarunujigawip.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_80fdb772d2c546e8895018a76b2f0a8a.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_9cd8e89c33e44450b16438192f41e2df.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_f866ba8acbca47cab1323231d9de8b89.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5700 bytes
SHA-256: 6ac7a366c95b4c1da8127793edb29cf901139949def56a72758b3eb869a68ad5
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10456 bytes
SHA-256: 3578f8f694b083bec520e17d4ade23fcbfc547cc4da1e3160898911da8be39bf