Malicious PDF — malware analysis report

Static analysis result for SHA-256 99850b7a1fd43317…

MALICIOUS

PDF

79.5 KB Created: 2021-03-12 14:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b420a814f8f3a15e6dbbdafd3af02e72 SHA-1: d61f5c9a54e3decd3e93cbc79373c9b92ec736df SHA-256: 99850b7a1fd43317bf1b9fe75d62fcab7bb18052d4c1a061baab1de7e6115049
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 0.9961

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://kuzutuzo.ru/strik?utm_term=what+is+the+relationship+between+cloud+and+sephiroth PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/TMvCDLo/bewafiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ff19c3422ec9.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/igiasii/88811547243.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/bbWOxrX/bedroom_furniture_sets_full_bed.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/PqXxhdr/sabirogekemogavepin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5ff97dbdc5288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5ff8f6b4ca295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5fd6a792d0563.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/fhdhI8x/catalogo_velas_ngk.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/e7ijMkE/71812350889.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/bfhiShj/sivajorisokoxudepup.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/jicjcYh/29882452478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fef4da1774c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/968c36d6-a3ea-440c-8ab8-6479bc3ef2db/towakefetavomalibepasa.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_133c85dc796d4a8ba3a34d74b1695663.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/545d90e5-7ecd-4205-83b1-eb53d6abc17b/sir_gawain_and_the_green_knight_text_analysis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f872b8d6-52cf-405a-aa8c-7c3515cd7016/reset_toner_counter_brother_hl-6180dw.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_ca87662d6c724def9a140b07d7a857a9.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_23099a359751498e87e6c2facde0eefe.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_dbeea3cb1d4d4169aabdd1d425175b3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c189bb-386f-47ca-8cf4-e0f69f85ffef/list_of_default_stock_brokers_in_india.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_3b99de6e3f7f48cb82e8f6998b4866a6.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_c3b761d78aea43f087d1fa2616228114.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_4c7f9ace35a843abae25820d813b81d7.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_d0762f2a3da74836a2ee82c58a11148c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f367b8-6a54-4f51-9f38-dcf1766fa54c/how_to_make_a_g5rv_antenna.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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 5408 bytes
SHA-256: 86ccb0f1106e6735e5063dcc1ac93507e21b2ef0ecd4c281ba6785443ce6a653
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10592 bytes
SHA-256: 62d29c1b9d864d721b01dab6ea959cdcba574fb5954fb71596d34928bf8292e5