Malicious PDF — malware analysis report

Static analysis result for SHA-256 9becab3315c2f6ac…

MALICIOUS

PDF

66.2 KB Created: 2021-03-18 09:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ea8ed3924c30196c46618b394b53f6 SHA-1: a53e986df5d7d1a6c2426c8c66a760cac3457243 SHA-256: 9becab3315c2f6ac97f215dbe8bbdbc61ec06886b8bdfe41d6b980cc19c0d61e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and file-sharing services, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external resources, potentially for credential harvesting or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • 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
  • 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://scripts.sil.org/OFL

Extracted artifacts 2

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

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