Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a224f15017e7f61…

MALICIOUS

PDF

86.2 KB Created: 2021-06-08 18:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 151af4cc06c070344e46a4a998c8bbfb SHA-1: a9ea1d37b3b9ddbf9efafa9a0912fea8d2e72ee3 SHA-256: 9a224f15017e7f61f69a247e5036377963a917b9320118b6b62951bf5af07bdd
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the PDF structure and URI patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/pbw?utm_term=anime+stars+fighting+mugen+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6052e46a93b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_604b575b508e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457281/normal_5feb836dcbc98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6064aa8da7ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_6040216f06909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fe11ad12706f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5fc9bf43a7cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602caf5eeaeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_60bedc3bea0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_602eb0680de09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5ff4d389cb535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotetidi.pbworks.com/f/50971093284.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144778233/lamborghini_song_ringtone_download_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9352b54c-f1ef-4bce-bd08-45790a1926c6/what_are_the_different_reading_levels_for_kindergarten.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/where_can_i_learn_basic_carpentry_skills.pdfIn PDF document text
    • http://devopiporo.pbworks.com/w/file/fetch/144729546/caller_id_changer_apk_7.8_crack.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/shopify_developer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4dcf74-5cfd-4d06-951d-e7f945792a2a/81371491510.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144439092/chemistry_matters_2nd_edition_textbook.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144793998/what_times_table_is_127_in.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 5168 bytes
SHA-256: 92ce2b1cbf414b133b94fd32bc7891e0aab6ffa2f5171d161d27958ef7f588e5
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 5620 bytes
SHA-256: 1f5de302f374400fac9df5d9ee7c0011c25f8e6c98c4e61ad8991126f1e25908
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 12772 bytes
SHA-256: 99047bae70a807cd227c765bc83af8a5d8ee5eb434024d42400babb9ecb61ae2

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