Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36856dc8bd06a92…

MALICIOUS

PDF

75.6 KB Created: 2021-03-27 11:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 608607e3823ce2e0e5ccb1c40259e77b SHA-1: 4b92f84caba0c6d2b00b45165d7f7bd41fa25139 SHA-256: b36856dc8bd06a923636abc49a33eaa0bb7ad4f48f79383d6961e827297b9725
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The primary malicious URL, https://ponafet.ru/strik, is likely used to host a phishing page or download a second-stage payload. The document body is heavily obfuscated and appears to be a lure, possibly related to recipes, to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=microwave+pressure+cooker+rice+pudding+recipe
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fe43d6f01709.pdf
    • http://letaraluzim.scienceontheweb.net/serifigovot.pdf
    • http://porepafenepiwim.iblogger.org/sa_white_book_kindle.pdf
    • http://korirojasutito.22web.org/pefifetu.pdf
    • https://cdn-cms.f-static.net/uploads/4409796/normal_605b39aa677c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bodajaku/66519514167.pdf
    • http://laxukumelukadut.myartsonline.com/lusibisarevudis.pdf
    • https://s3.amazonaws.com/nuselufuzo/gmat_official_guide.pdf
    • https://s3.amazonaws.com/lemerisinivum/descargar_whatsapp_plus_gratis_2019_apk.pdf
    • http://wovovaj.rf.gd/how_do_i_calculate_compound_interest_without_formula.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_62d4aca135cd40b1a0ca881912c1687a.pdf?index=true
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_6969782f846c4f4aa9fe7e8ffebee1f5.pdf?index=true
    • http://rugoxag.rf.gd/72112532999.pdf
    • https://s3.amazonaws.com/mogipegi/cwna_certified_wireless_network_administrator_study_guide_5th_edition.pdf
    • https://s3.amazonaws.com/voxulija/kusovuv.pdf
    • http://gozipoxux.rf.gd/57426289073.pdf
    • http://fipikam.epizy.com/basic_english_grammar_rules_for_bank_exams.pdf
    • http://fabupumow.epizy.com/echo_srm_225_string_length.pdf
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_e57c107c734942faa2ac70e76e3842ed.pdf?index=true
    • 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_off0000e60a.bin
59265ce404678af9233fc8f1b574b774e31f308a78258cd22175c5e375920558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5432 bytes
font_01_sfnt_off0000f8ba.bin
0b646767322266a9c9e513ab3b549d0a5e94f0168914138cc6c9c4c2e3ec6de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 11672 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.