Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a433d8d30bdd9d…

MALICIOUS

PDF

80.2 KB Created: 2021-04-04 15:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 465c4156f51d0a47798156875a8bd707 SHA-1: ae92433c538c8198920d24c5bad599e5c2499b35 SHA-256: 52a433d8d30bdd9df16fd3f20848ab2b606f667cc175e4698f4128cad29a9110
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The primary malicious link identified is https://dafemum.ru/strik?utm_term=how+long+after+smoking+does+your+body+heal, which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to health information, likely to entice users to click the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+long+after+smoking+does+your+body+heal In PDF document text
    • http://galoomer.online/40667549611irp9n.pdfIn PDF document text
    • https://cdn.sqhk.co/jezofadu/WLmdUhc/pomow.pdfIn PDF document text
    • http://radanews.site/65660950958r636c.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/0fccf.pdfIn PDF document text
    • https://cdn.sqhk.co/sivujazozis/ghYggxd/transport_tycoon_deluxe_espanol_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/7gfhjqk/speed_night_3_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/givukugitewe/lQGAs7v/nosudegilogewemuguwaxuval.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/13436145739.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/assisted_reproductive_technology_guidelines.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/gasebi.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/e1jdMFW/heart_emoji_snapchat_filter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_9407465b7a3d4e75b59f0626bc1a9b25.pdf?index=trueIn PDF document text
    • http://solarujarinobo.myartsonline.com/28250959391.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/hiperaldosteronismo_secundrio.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a80c0e0ee5174978b6ab81feda34f413.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_fe1e17d5278f410d818d32bba7aa41e4.pdf?index=trueIn PDF document text
    • http://todidetiped.onlinewebshop.net/35829294772.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_251390e19b2540e3a1db8c44311a0ac4.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_535d5a86e8104ac7b9a1545695688d9d.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_9713f33e89fe4085bcbc233fb78b2ed4.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 5680 bytes
SHA-256: 4fd380e28b657b27eb915675b911c6bb3a3f2c13a5a8704dc0484d0718ed6297
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 11200 bytes
SHA-256: 51397b0415a763bfdc8906831606f8b9d4e73e53bc16dfceb61898dca994af1c