Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec671de6874f8e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-09 00:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 241d5c1f63b37eaaf7e8f46d9b98b660 SHA-1: 2f7a7a6659b6afbcf922421b26838c2f41555daa SHA-256: b3ec671de6874f8e30c418db6a0aaecd3676950838fa7b9a2bec8b8ffb80bb8a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=how+to+run+a+retail+store+successfully PDF link annotation
    • https://cdn.sqhk.co/vuvapolaxaj/fReichb/21545032708.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/vizalivaxula.pdfIn PDF document text
    • http://ritikutoxukor.22web.org/nikaju.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/gumugul.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/idnCbD4/runner_duck_breeds.pdfIn PDF document text
    • http://jufimeja.iblogger.org/87603380468.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/d61nCwX/5516819509.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/cy0jbii/64707914988.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/hijjghf/kepolubopu.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/ijidbij/dragon_city_hack_game_guardian_mod_menu_2020.pdfIn PDF document text
    • http://monabis.iblogger.org/como_fazer_assinatura_digital_em_arquivo.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • http://levinorutuw.iblogger.org/integrated_chinese_level_2_part_2_workbook_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/MgfFjXX/47779541286.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/kanivogabugazop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonulurejojele.epizy.com/28493781452.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/netgear_n300_wnr2000v3_range.pdfIn PDF document text
    • http://jabisuluro.epizy.com/creature_3d_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/rijekiwawelenax.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/96662472811.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 5032 bytes
SHA-256: 8256c8c28266a582f22846afd4d1484e85db5e1e0efd36717a1b824da34aa45d
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10420 bytes
SHA-256: 54aa4a1d326f268f04190a7175d415b3c6d87260eaa228276b0ec0a3c5dadb96

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