Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d5ff9921118c9e…

MALICIOUS

PDF

85.1 KB Created: 2021-04-23 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b19d2274ab6efa45cf7450f6b0e0a39 SHA-1: 985640d5891297ed9c6929535013209f83b902fa SHA-256: c4d5ff9921118c9ecf01d83b95ce903c0ebc07161093d4662600a9e016900c85
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains commonly associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to car towing capacity, suggesting a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+much+can+a+2015+subaru+forester+tow
    • https://cdn.sqhk.co/jabisopomuxo/gegcyEM/wabedu.pdf
    • http://natorg.space/8926413907838eou.pdf
    • https://cdn.sqhk.co/gogojiranat/h9hh9he/archer_cathro_julia.pdf
    • https://cdn.sqhk.co/bigokukanuf/tcjcje6/wrc_fia_world_rally_championship_arcade_ps1_iso.pdf
    • http://fruits-summer.fun/losifidizevezelaxadaxifip073fr.pdf
    • http://zoneeuro.pro/unlock_guided_access_on_ipadpe3ey.pdf
    • https://cdn.sqhk.co/julukimesof/cP2EgjZ/word_connect_crossword_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_ef6657d3952f436f90b70e5876410646.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e28ba42-6969-4063-8ab8-66b2fed5c51f/63751598561.pdf
    • http://kirogebi.epizy.com/how_to_register_my_ipad_on_verizon.pdf
    • http://kodasakame.rf.gd/tisivawagowiragigi.pdf
    • https://uploads.strikinglycdn.com/files/68422d3d-0837-4041-8386-58be60c3ccd6/when_to_use_imperfetto_and_passato_prossimo_in_italian.pdf
    • http://tekonudobigu.rf.gd/56351803626.pdf
    • https://uploads.strikinglycdn.com/files/949393f5-f527-4186-96bc-9c5197cc4007/miguel_serrano_quotes.pdf
    • https://uploads.strikinglycdn.com/files/8f6cc457-8ab5-45bb-81cd-36c2cf16a702/how_difficult_is_it_to_study_law_in_canada.pdf
    • https://uploads.strikinglycdn.com/files/c848f4d0-6a34-49a2-bedf-c28b0a109243/fizonuz.pdf
    • https://uploads.strikinglycdn.com/files/a0aa23f3-ddf7-48f1-8a1c-f182fd0cdbf1/bergeys_ford_inc.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_649e19e7a4c7421b8caef70a19db4e0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3af8d3c8-be2a-45f0-b300-7cea21a242f4/5652138483.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b43.bin
62cce3a5ffd3a28a1c011da5a9f1bf1f286f04a9d5b37dc44914582941a95d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 5732 bytes
font_01_sfnt_off00011eb8.bin
c1a4ab9f0b921f9e4d35d2b6a8aedabcdb262a1949c9ae7df220b2cd6166a25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 11860 bytes

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