Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bd4d459dde8553…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 09:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a05f487b5c66cd53c43c0dd679bb35 SHA-1: 1bb67d1fa4d69692990e4f1cf92811791baecf26 SHA-256: 20bd4d459dde855379c7b205c57c790280eb1466150eaaae515f7c9635b2e7d2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious external websites, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/aws?utm_term=comparison+roomba+960+vs+980
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fc5b6130dc63.pdf
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/jotoj-suxaxov.pdf
    • https://static.s123-cdn-static.com/uploads/4494874/normal_6002ad7178b0b.pdf
    • https://lokedidige.weebly.com/uploads/1/3/4/3/134315074/nunafibigorasupakaf.pdf
    • https://fowezojufogomod.weebly.com/uploads/1/3/5/3/135307270/5686135.pdf
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/napinefudu-fifojisebo-japojisusek.pdf
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5fefaace0e35a.pdf
    • http://leaninrzpd.site/worx_electric_chainsaw_wont_startu1n0u.pdf
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6013aff6700d1.pdf
    • https://cdn.sqhk.co/lixabanitav/hfDdc83/xopus.pdf
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/4890161.pdf
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/7906452.pdf
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5fe6f7926ab79.pdf
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/wabonize-vupigukira-silanovogeguk.pdf
    • https://cdn.sqhk.co/fafujedajir/jgjbHnM/binepi.pdf
    • http://axecheat9.xyz/xutisoluvubigerepzg6y1.pdf
    • http://znakomstva18x.site/ariens_824_snowblower_belt_replacementzwztt.pdf
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/5ad446d0127.pdf
    • https://cdn.sqhk.co/rapigufagi/ghhjjjd/pokemon_go_raid_boss_battle_simulator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed37.bin
2130c63b07665ee8d62091c181641322a0fc6481f3fb4300294d86554794790a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 5684 bytes
font_01_sfnt_off00010061.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 2140 bytes
font_02_sfnt_off00010a3b.bin
234a47e17b5c4e879160323363d464f3acfea29b259462fcf0f9651ec31858fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 11080 bytes

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