Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acf3294f59f4367…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 00:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa9c765d9bd6a6082de343f78081eec5 SHA-1: dc4c171518e12db7936366440421e66562e5f22e SHA-256: 7acf3294f59f43673ad9f1100ecd58f13828d46df05909de4d952d477d42ca32
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/wix?keyword=qq+music+cracked+apk PDF link annotation
    • http://kopuvimu.scienceontheweb.net/47734098814.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/ja9Njfi/rulatuwuxoga.pdfIn PDF document text
    • https://cdn.sqhk.co/zewawugawa/egda8hj/doguvusoserabomapuvawi.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/18954756124.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/HpjjGji/xbox_cloud_gaming_apple.pdfIn PDF document text
    • https://jerepuda.weebly.com/uploads/1/3/4/7/134745202/1c1e56a.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/6c6fa2.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/gcjjhcv/mini_racing_mania_multiplayer_racing_mod_apk.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/312b8bb9b.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/ijbih8s/jufitawobetax.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/bidanede.pdfIn PDF document text
    • https://cdn.sqhk.co/lebuwoxetale/hfhbAjX/52312998832.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/excel_macros_online_tutorial.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/tajurod.pdfIn PDF document text
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/8047243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/788df4f2-8176-4d29-b2ca-238b327a7c2f/1321468736.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/76804130261.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/20406636877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b39ff8-9e80-4866-b545-3f495e46d1cd/rebokurovore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f9d905-1cd7-41dc-9dd7-3b47b6ae7f1f/99508965129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331f4927-028a-4ed2-a0ec-f329a5c3a46e/hp_officejet_4500_desktop_all-in-one_printer_-_g510a_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c827ac83-9236-47aa-b236-8f4ac84d3f0e/41331613357.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/commercial_kitchen_hood_fire_suppression_systems_cost.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 3752 bytes
SHA-256: 98d08af1419611a60cb66824cc8929ca610b44b11ea5e670dcb5ad6b877af94b
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5436 bytes
SHA-256: 43c354246c57ccdecab36041febfdd55ad08c60aecfa8f8c51cb5470408b0e27
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 11444 bytes
SHA-256: 14dbe580327543a1a2271404e825c19041553bb04655d9a87608af5311710318