Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c4d02e5b8672a5…

MALICIOUS

PDF

110.3 KB Created: 2021-03-13 21:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69cc97926237835955287c2954382421 SHA-1: dcb65eb48cddfa8c2cd5aa303d421530b81e7a43 SHA-256: b6c4d02e5b8672a5dfbeec50c8737b78a9d43de6bf8b75567ebc3a32ae5f82b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which point to potentially malicious domains, suggesting it's part of a link farm or SEO poisoning scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=cultural+relativism+and+universal+human+rights+jack+donnelly
    • https://cdn.sqhk.co/suwojixuwebi/ifqhen4/supersprint_race_exhaust_e92_m3.pdf
    • https://cdn.sqhk.co/xedomobedusi/idptibk/wheels_on_bus_video.pdf
    • https://cdn.sqhk.co/kewawukufiju/hb0gfrG/38175512142.pdf
    • https://cdn.sqhk.co/bebetirifam/TsfWjC4/72940650054.pdf
    • https://cdn.sqhk.co/dumotometapo/hhefjjy/cyberpunk_2077_countdown.pdf
    • https://cdn.sqhk.co/zebenane/icSZg9A/tolapede.pdf
    • https://cdn.sqhk.co/vonirosidejo/giuiecI/20545901921.pdf
    • https://cdn.sqhk.co/bisuligiga/Bjgjj1F/chikku_bukku_raile_song_ringtone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36c7cc68-87de-491a-bce4-b7d773d69ff8.filesusr.com/ugd/3254bf_8fe7dacb34f34b59b93faefdf57fe16f.pdf?index=true
    • https://s3.amazonaws.com/levumoduf/65548099765.pdf
    • https://uploads.strikinglycdn.com/files/bb85193c-fa9a-473b-a15c-80bc5b810a3f/how_much_does_bubble_tea_cost_at_kung_fu_tea.pdf
    • https://s3.amazonaws.com/zijivevip/23431147628.pdf
    • https://uploads.strikinglycdn.com/files/68358670-2073-459a-b9d9-115cc4cdcfab/zogalixuduvidigu.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_fcc6ba755c8e4c9c91fc4817aac444b7.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_306983ab731441c4b2b3d91411b705c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df94aa97-0140-4634-a59d-b2456b8269b4/diary_of_a_wimpy_kid_deep_end_free_download.pdf
    • https://uploads.strikinglycdn.com/files/a6b48e04-5c72-4b0e-ac4f-b88698a70587/checklist_for_new_home_final_inspections.pdf
    • https://uploads.strikinglycdn.com/files/1d6e3c26-bfdb-497c-9c80-bbee9c66ab1a/migejotimavuraminititoge.pdf
    • https://uploads.strikinglycdn.com/files/bb518432-cf12-4fab-8e90-2eccce5e029c/28895441984.pdf
    • https://uploads.strikinglycdn.com/files/b1307e01-8ff2-4613-950f-18959905e0b7/cosmos_and_psyche_book_review.pdf
    • https://s3.amazonaws.com/dixaleko/how_to_repair_windows_10_boot_from_usb.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ea946e39710e45eea56111f75b294f6e.pdf?index=true
    • https://s3.amazonaws.com/lusabifef/tunonotatozu.pdf
    • https://s3.amazonaws.com/kitakilesa/74159710815.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_off00017172.bin
925df3248a13f22c3716662797688f5bb417c5e9667e40b5132c78a30a9a22e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17172 5560 bytes
font_01_sfnt_off0001843c.bin
13c532d2efc0d6543043d70eb89d1ed45c58fcfb2c898dccdecc16469eba3128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1843C 11232 bytes

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