Malicious PDF — malware analysis report

Static analysis result for SHA-256 557922a0b8e81aec…

MALICIOUS

PDF

75.7 KB Created: 2021-02-15 19:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 531e80893bcba9996eeae060958a9242 SHA-1: 3d06e9414582c8b34cc3e103e67572e61f2dced6 SHA-256: 557922a0b8e81aec47e66297cb3dda565a0dc12166fb1c92dc6713b1386079b3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://jacksth.ru/strik?utm_term=pyramid+principle+summary', appearing to be the primary lure. The document body, though heavily obfuscated, suggests a deceptive pretext related to a business principle summary. The presence of many disposable domains and UTM parameters indicates a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=pyramid+principle+summary PDF link annotation
    • https://cdn.sqhk.co/kexofebiziv/ejetggQ/weekend_box_discount_code.pdfIn PDF document text
    • http://gaberiwilovu.22web.org/67254084213.pdfIn PDF document text
    • http://mnclassis.org/wosukevmyosn.pdfIn PDF document text
    • http://karnaval.host/six_tales_from_shakespeare4ycbj.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/8hgjhij/nopudusodubolinozamufu.pdfIn PDF document text
    • http://thepropheticapp.com/juzumanuxozolowufem0u6w5.pdfIn PDF document text
    • http://gelivebun.22web.org/yamaha_timberwolf_250_4x4.pdfIn PDF document text
    • http://voztrans.ru/xovelofiroruu8r3d.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/fhfwRje/tosopiwotafuwelufal.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/fidhjjf/gwent_the_witcher_card_game_platinum_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatafefot.rf.gd/dead_poets_society_movie_subtitles.pdfIn PDF document text
    • http://nipobotigopimon.rf.gd/46028857000.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/bonorogafegoxozex.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/beaver_scouts_in_france_uniform.pdfIn PDF document text
    • http://wadarudi.epizy.com/cdburnerxp_gratis_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/84489902994.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/anglo_japanese_alliance.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/67464829895.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 5320 bytes
SHA-256: 126c9fa12b366d71c42bb12d20f569be48eb7f134ed197043e03cdb43425a685
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 11044 bytes
SHA-256: fd184534e3b05a9904205f1cc0e084459fbe02492187a005bafe0a0c5fcbafac

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