Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cb491855ea43d8…

MALICIOUS

PDF

65.4 KB Created: 2021-02-26 22:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e9e1d8e6a84e09a63c077f2606268d22 SHA-1: a60a0ea5cce9654f4bdde4375c6b7ca2927bc8c3 SHA-256: 84cb491855ea43d895ceff5afbe8390b466c31be1b322d1a682a8cd049ec497f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL, https://soxebez.ru/strik, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+many+calories+in+dunkin+donuts+medium+iced+caramel+latte PDF link annotation
    • http://pakirekugep.scienceontheweb.net/lumix_fz70_manual.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/xijepexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_601b1e32b1d44.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/b7f7f48fc.pdfIn PDF document text
    • https://notetezowinebax.weebly.com/uploads/1/3/6/0/136019470/9610884.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/virilumiv_kesugikita_gibawara_ponuwewavaba.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/midedopaxules-minipatafepa-nowowexebi-gofizipojetexo.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/pasovaxizunavu.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/1046677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_5fd65819f0a4c.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/universal_remote_code_for_toshiba_tv_dvd_vcr_combo.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/xigudawakigiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5ffe8798c77e2.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/6320547.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/86314596107.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/lezopobigeza/vumakoverepiputawike.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_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 5304 bytes
SHA-256: 37e39479ee98dec6b486383d90f8c9428a7d1ac0a1074233249caf1479022e07
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 10100 bytes
SHA-256: 50835910b98edc3dcd81c5d692192862cad107fdb1e206dc85f1086536984c5b

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