Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac665b5d8fc978d3…

MALICIOUS

PDF

74.3 KB Created: 2021-01-28 03:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d5e29fbd2f61b46e4af6aab13f15bfa SHA-1: e6cca1a3a8b52b7ee26037f2aa1a09b7b4eef0af SHA-256: ac665b5d8fc978d36cd3114e2f39d2a539ca4be5625d59b50a8465cf9cf81341
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/123?utm_term=garcinia+lean+xtreme+where+to+buy PDF link annotation
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/e435c.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/cpigigh/spider_man_maximum_carnage_comic_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/LjdOSii/16843983867.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/gghdFzA/javuvobaj.pdfIn PDF document text
    • http://afracheat2.xyz/dowodotagidobebexal7goa.pdfIn PDF document text
    • http://gajozemexip.22web.org/blauj_dizain_2019_images.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/dowalatorasarexa9m4ni.pdfIn PDF document text
    • http://lienforkid.com/centinela_valley_ipa_authorization_request_form2xz6h.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/6045082.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/jjifii3/28307992432.pdfIn PDF document text
    • http://arboozfilm.com/xupejikorujewuo0rbf.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/3WOhdhc/full_drum_set_for_sale_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/hijgvgg/dash_colors_python.pdfIn PDF document text
    • http://gta-msk.ru/86681573046lz46a.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/gegibumunige.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/sokujokeranogarifumajaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repewuwutopin.rf.gd/70124825025.pdfIn 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 5296 bytes
SHA-256: 3249c5beb716770561ce334548b9aff4e029245d1ca0bce04a81f9a3164c5ebe
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10596 bytes
SHA-256: d338a5c7133c00410666c334cda0d111ed8670da9f46e616c68a861d83eb91a1

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