Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f43423e8ddfc2ee…

MALICIOUS

PDF

80.1 KB Created: 2021-03-03 13:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cebb3b52061651df6e1c60cefa36d8e9 SHA-1: 1448e00d444bbab244efdffd58a6f67bdcbe85d5 SHA-256: 4f43423e8ddfc2ee9f8263f024b40ecf1d2656e7f73c5e7a1a4c3a1754f3811e
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though partially corrupted, includes metadata related to 'wkhtmltopdf' and a school yearbook, likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=lugoff-elgin+high+school+yearbook PDF link annotation
    • http://martakkord.ru/rex-c100_220v_digital_pid_temperature_controller_kitsbbsz.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/patenakejud.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/popasubunap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_602731c44a945.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/hajg6NG/sandstone_flags_warrington.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/jhUdhaA/hotstepper_meaning_police.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/jhjhRku/ups_goleta_pine.pdfIn PDF document text
    • http://recepty-dd.info/kunonirexonoxe2mlhk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_602fbeebb213d.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/gegfgcy/jemixe.pdfIn PDF document text
    • http://nomokosu.iblogger.org/38355848852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_600674007f7c7.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/baaton_ko_teri_full_song_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hggeggg/2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_603308895643e.pdfIn PDF document text
    • http://igbusinessabouthelp.com/b4u_movies_2018_punjabiftgdn.pdfIn PDF document text
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/f9ab0105fbd24f2.pdfIn PDF document text
    • http://prizinsta24.online/wheel_size_comparisonlcvyw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebemowabekoko.rf.gd/76648200438.pdfIn PDF document text
    • http://wumumusonozukak.epizy.com/android_build_version_21.pdfIn PDF document text
    • http://delonewafunedi.rf.gd/fodoripukusujupugiviloxud.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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5424 bytes
SHA-256: 568a72a8531c51210b9c430d862fd6b6e6743dfc337e25c0387801fd6290a4e6
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 12492 bytes
SHA-256: d3b2656d583652ee501f764b7846d0a973b1dbecd12d06ea1def6bf38c734117

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