Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c8c8fac85328bf…

MALICIOUS

PDF

60.6 KB Created: 2020-12-17 08:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6a9a1cd78eebe847ff4d4886d703d8e0 SHA-1: 900a0485a682c13f77eb3332c95cd54657c3181d SHA-256: 88c8c8fac85328bfc20f2a73555f8a2530adfab0722a31650696db0cac40b7f6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_LINK_FARM heuristic firing suggests the document is designed to host a large number of external links, with one prominent example being a URL pointing to 'traffnew.ru'. This indicates a likely attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=cedar+grove+middle+school+wv PDF link annotation
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/gejidosagi.pdfIn PDF document text
    • https://mosunenipotope.weebly.com/uploads/1/3/4/7/134767451/bddae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5523bd26ff1194f913b76/t/5fcd94032fa8bc6bcd034ca6/1607308293701/love_tester_real_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/17626538152.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/once_upon_a_time_nadine_gordimer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc389b02cf09257bd7c80b9/t/5fc9aa992ae1264a038e8aba/1607051929743/electronic_music_genres_list.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/ludidule.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/goldberg_variations_aria_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/bonnie__clyde_justified_online.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/mekanawanewu.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/39100076726.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/51988179926.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/83070867469.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/beginners_spanish_books.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/probation_form_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/fizap.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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 5412 bytes
SHA-256: 50c3e4499496f7b75bd4d9f8dfbff62718315c5f0d53d4499d452e9a83bdd634
font_01_sfnt_off0000c2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CA 10240 bytes
SHA-256: 8280b69151140f804f05458af98b0317242a4c53ea05cf64ef5dc3dd3b6f5019

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