Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d979dc477f7a8…

MALICIOUS

PDF

87.5 KB Created: 2021-02-23 02:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 383f97d94507539d39a1a577fa24e498 SHA-1: 263f67ae0cb08b1662373805bcd45e65b5a2d90c SHA-256: de9d979dc477f7a8690b28bbd24860cc58a4caace0aadb271482be24b528e1cc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable domains and cloud storage. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often associated with SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=%25E0%25B8%2599%25E0%25B8%25B2%25E0%25B8%25AC%25E0%25B8%25B4%25E0%25B8%2581%25E0%25B8%25B2+casio+g-shock+%25E0%25B8%25A3%25E0%25B8%25B8%25E0%25B9%2588%25E0%25B8%2599+ga-100b-4adr PDF link annotation
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/815a383.pdfIn PDF document text
    • https://cdn.sqhk.co/lefidotoxono/eghhimQ/red_blue_red_yellow_flag.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/iigicja/74027662365.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/fge2hd2/64963544154.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/animals_hd_images.pdfIn PDF document text
    • http://kezefufeg.iblogger.org/first_walking_dead_comic_book_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jdgeIhb/sun_prepaid_promos_surf.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/6222725.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Tgfgfso/amaze_heater_installation.pdfIn PDF document text
    • http://votamomitep.22web.org/falador_hard_diary_guide_osrs.pdfIn PDF document text
    • https://linonojito.weebly.com/uploads/1/3/1/3/131380720/87090afb.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/73806921047.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/gigevij.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fab1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAB1 17008 bytes
SHA-256: c9a7e1d111339f4dd921e1ecc5480afdee8957eb6fa8e1c9bf96b4d152422649
font_00_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 5592 bytes
SHA-256: 6b708f484d54b960b02f32e3f34e7cb777ee634c0efdbaa6d438daf10db27e87
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 6872 bytes
SHA-256: 392af04422735ab52fd37247fcdad58a8daf4402c76d66b7748d536a42303a76
font_03_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10720 bytes
SHA-256: e169f3b775c8994a1f69bbf9ed2602712be295e380448ee79593ca6d14c8282a

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