Malicious PDF — malware analysis report

Static analysis result for SHA-256 08232124367e787a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 15:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0478e8c34c5985919234557086808a12 SHA-1: e623f07ee7084ee016ec6ac08c968b496463e7a8 SHA-256: 08232124367e787a5b30c41adc669c06abf84dcb2bbce8523207b5ed8c1e14dd
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are disguised as legitimate files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=keller+auditorium+seating+chart+pdf
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/ff73034b9db7258.pdf
    • http://leftoutclub.com/skyrim_special_edition_achievement_guidefp0wr.pdf
    • http://am-sound.ru/27041894155lpoby.pdf
    • http://xuputunoxukir.22web.org/most_common_idioms_and_phrases.pdf
    • http://crispyset.online/37989183545qfqo3.pdf
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/jizudajixakid_tuzenizev.pdf
    • http://saxobupazes.sportsontheweb.net/reaction_mechanism_worksheet.pdf
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/vijekowojebifuf_lowimok_katubupe_wilomo.pdf
    • http://delinapod.mypressonline.com/2._what_are_the_reactants_and_products_of_cellular_respiration_and_photosynthesis.pdf
    • http://vijutiludomin.iblogger.org/lesiradevotaxipamitodama.pdf
    • http://erogan-oficial.site/bose_remote_control_app_iphonernqg5.pdf
    • http://bit-ipo.ru/what_is_the_difference_between_cradle_to_cradle_and_cradle_to_gravenfw8w.pdf
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/zubad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_1267bd80d563404d942363d6f3643168.pdf?index=true
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_fc1f9fbab29048bf8284b76f7ef19fbc.pdf?index=true
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_d78d64bae2b54102aa0a91620aca9e70.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_7fc8c4d3b79645e58ae3297aecaa958b.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_eebe3aff4c944764a7267201657b6ee4.pdf?index=true
    • http://legokejapo.atwebpages.com/12412694554.pdf
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_5b6ed6185be94eef83863ce2f25e6bf7.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_1e86e4c253604d32878dee380f1f0a42.pdf?index=true
    • http://najukelosuned.myartsonline.com/94204044918.pdf
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_f5368d382b7c4bf2a2a550abf1ecf784.pdf?index=true
    • http://virajemoxazam.rf.gd/gevesabatiposixekinolure.pdf
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_f1d219bd52464636865879d99619224e.pdf?index=true
    • 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_off0000ec89.bin
ede4289d2b7cda4b828fe75afe8408e8643a444f80f2ffc53a549f06d2d02720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 5536 bytes
font_01_sfnt_off0000ff3f.bin
1b7c746aee5d890e484499e297286b435fd691d18d1c0648df296e1551958000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10304 bytes

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