Malicious PDF — malware analysis report

Static analysis result for SHA-256 0985360086c27e52…

MALICIOUS

PDF

88.0 KB Created: 2021-02-27 16:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bb223232692978f4a4bd153dd38f0a6e SHA-1: 3f33d448bed1dd69c20b8debf8c40bcaa153e93b SHA-256: 0985360086c27e52e61f19f39678eeece632c9f1046e3713843e0106d6a30529
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains references to 'Playstation vita emulator games' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site disguised as search results.

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://seumenha.ru/strik?utm_term=playstation+vita+emulator+games PDF link annotation
    • http://zixudivibudizu.scienceontheweb.net/kumutitirozarod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_5ffa3df5d27d8.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/fanuxepadoj.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/rexude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_600de2a39d6de.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/sajobewipovu-gagogitixim.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/jibonodo-torewara-wipotut-sebudikodugotod.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/58071545009.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/66797454198.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/jeggjbH/xtreme_stunt_bike_rider_game_download.pdfIn PDF document text
    • https://sapujufokobifaj.weebly.com/uploads/1/3/4/8/134847621/6646853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/multiplication_table_till_30.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 5168 bytes
SHA-256: d0e8b62ea2ec0c85a8c457a127eb0707be92892bbcd3a66cb05ec564605c5fe8
font_01_sfnt_off00012f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2D 10572 bytes
SHA-256: 1e9d7b8c8833a6d50446dc773a3382ff31c191e3fd057d3164ed21e4f31573d4

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