Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94ebb2a75f8774d…

MALICIOUS

PDF

120.6 KB Created: 2021-05-22 13:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 483b123c5b20f962c7a775562e952c3d SHA-1: 2a1998b1c809e2dfb72e31fe76dae2277af6e134 SHA-256: b94ebb2a75f8774d26ebb2a1f9204c59334c16e475799e03a526c6241c5b33a5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to create numerous links on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=do+i+have+hypermobile+eds
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5fe59377be244.pdf
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/vuwebaf-sakibakaf-borifigumujov.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/0d57f.pdf
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ffa633c0aa47.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_604620f1706ce.pdf
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/3619741.pdf
    • https://cdn-cms.f-static.net/uploads/4488329/normal_60502a7e259b3.pdf
    • https://cdn-cms.f-static.net/uploads/4445882/normal_6046414548cd4.pdf
    • https://zidujakokogaj.weebly.com/uploads/1/3/4/8/134892028/8878069.pdf
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5fce20acd66a0.pdf
    • https://cdn-cms.f-static.net/uploads/4494883/normal_604849e6a2676.pdf
    • https://cdn-cms.f-static.net/uploads/4393637/normal_600c7fa2dac66.pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/8999223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/edd61f5c-a2cd-426f-a9b7-c091b7dd45d3/2013_dodge_charger_v6_top_speed.pdf
    • https://s3.amazonaws.com/sorogamat/why_is_my_monster_led_light_remote_not_working.pdf
    • https://uploads.strikinglycdn.com/files/37b69307-5b47-4fa9-8c5f-b87142ec04da/romeo_and_juliet_movie_1996_where_to_watch.pdf
    • https://uploads.strikinglycdn.com/files/557822bf-ac81-4854-aefd-cb737fac6051/60009006995.pdf
    • https://s3.amazonaws.com/kesumasaka/50774937570.pdf
    • https://s3.amazonaws.com/muvemasoxaji/73142088670.pdf
    • https://s3.amazonaws.com/baxekojojexusol/legend_of_zelda_encyclopedia.pdf
    • https://s3.amazonaws.com/xakusineba/windows_10_for_enterprise_administrators_free_download_full_version.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001993f.bin
9a2bb635ed5a621263bf974b135bba275446380872c81af9549ba0a3ec528662
pdf-font-stream PDF embedded font (sfnt) at offset 0x1993F 5500 bytes
font_01_sfnt_off0001abcf.bin
f83cac04da8cf40ce0c402639054fe8fa34aa739643244fc1a6d8109f34bb134
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABCF 11892 bytes