Malicious PDF — malware analysis report

Static analysis result for SHA-256 a133c44b382c8f22…

MALICIOUS

PDF

79.6 KB Created: 2021-06-05 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: af9fe41e1ca051d58ccca57ea4171e42 SHA-1: 577fd56bf590e45fdad091f158a4a2ab782eab9c SHA-256: a133c44b382c8f22172043841b966b050943a9beaeb3dcd6991b7107c51bf05a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=fire+emblem+three+houses+guide+tea PDF link annotation
    • https://lupupoxapupep.weebly.com/uploads/1/3/4/4/134493602/4351176.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/8136902.pdfIn PDF document text
    • https://belifexemanugo.weebly.com/uploads/1/3/6/0/136051541/jilaradozu.pdfIn PDF document text
    • https://faruxolumapegi.weebly.com/uploads/1/3/5/3/135341403/xerelogivopodi.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/60d9125a3.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/tatijojemifijeba.pdfIn PDF document text
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/8792163.pdfIn PDF document text
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/7c895946b7a17.pdfIn PDF document text
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/3b7db03550.pdfIn PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/pawimuli.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/xofutuseli-tokoluwevukip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422955/benvolio_and_mercutio_relationship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632e12cb-25cf-4062-ac6f-4c333a2b7bf5/what_to_invest_in_2021_bonds.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/tejabarutadifepa.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/sidurer.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/33027342440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6725582c-537a-4162-8add-d6c2cc931fea/pogerisuketaliboti.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/w/file/fetch/144649161/fogobobixodozamotane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed291c8-9018-40e1-8f2c-25d0d5da14b0/pasos_para_resolver_composicion_de_funciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6908c1b6-8a3f-4cfc-8d04-1b864784f887/what_can_i_use_to_lubricate_my_elliptical.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144518841/why_read_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddad12d-e937-4945-ae61-313888e9bee9/20825308872.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/8452973521.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144503232/lista_de_verbos_irregulares_en_ingles_por_grupos.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 5332 bytes
SHA-256: 14e75976c4dfae77a833d28a1e6214169e5b7549b37e95bcc9f847e2d8f6be3a
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10752 bytes
SHA-256: a7955dc89b8b9d0eea7d981ffa0fd348620f3b4df9e9a4683dcfcbe8207d94b4