Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba20c20bed771bec…

MALICIOUS

PDF

85.3 KB Created: 2021-05-16 14:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b8220f16a44d98e1301588eecb81c3fd SHA-1: b13461b9a50470aa49e3cbdb74fc1bdc5bc0021d SHA-256: ba20c20bed771becbf073982614ac8faea71f72e431d1e677b48e65c42596867
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The primary URL observed is https://ponafet.ru/strik?utm_term=family+life+merit+badge+book+online, which likely serves as an entry point to this network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=family+life+merit+badge+book+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481065/normal_5fd9c18b77538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd7228e32212.pdfIn PDF document text
    • https://nabaduvikarupad.weebly.com/uploads/1/3/4/0/134096068/c25831f.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/gjXihE3/dreamline_shower_base_34x60.pdfIn PDF document text
    • http://grusha.space/mugez05ggt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_60248997861ba.pdfIn PDF document text
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/kiremavosodut_gadizukis_jogebibe.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/jcbNyoQ/furreal_friends_gogo_my_walkin_pup.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jC4tiaI/98724152799.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/fjjDgcL/dragonite_extremespeed_sun_and_moon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_606df96e8a036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6029cb62df49e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5ffe81bcdcdf3.pdfIn PDF document text
    • https://midagadin.weebly.com/uploads/1/3/1/3/131381693/b25c9b25e72a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fed5260a1b57.pdfIn PDF document text
    • http://paypallsecurity.com/dapple_dachshunds_for_sale_in_missouwtlx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_605676776c3c9.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/86f31f.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/heCgfnx/last_fort_of_world_war_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6024a7cc83995.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/b74000f24eff994.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/gosalulibug.pdfIn PDF document text
    • http://limecash.xyz/caramel_frozen_coffee_dunkin_donuts_caloriesgvbij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 5312 bytes
SHA-256: 7db7d9f1bc5f74c3de5b5058f1b30f7a9ac50c8bacdb621d6f263cea9fc0fbed
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 10704 bytes
SHA-256: 3a201fd40edb3135d5c957f8f662d72bb8fcd7f4efa9b152bed219df3c619d63