Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d10cf083481102…

MALICIOUS

PDF

78.5 KB Created: 2021-06-09 06:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e04250648183528ba39ed93489fece4 SHA-1: e5effda39dbb0dc97f515635d6d27074611563ed SHA-256: 74d10cf08348110288bb458307eeff584c48ceafea49bddf70800403ee719965
156 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 phishing or trojan payload. It contains numerous external links, suggesting a link farm designed to redirect users to malicious sites, one of which is `https://coretry.ru/pbw?utm_term=download+among+us+pc+latest+version+free`. The document body, though heavily obfuscated, appears to be related to downloading software, likely a lure.

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://coretry.ru/pbw?utm_term=download+among+us+pc+latest+version+free
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5ff7e76602b20.pdf
    • https://xovodozavaso.weebly.com/uploads/1/3/1/0/131069890/3293801.pdf
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/0fb23af16068b.pdf
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5fceb5db307b5.pdf
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/bazopad.pdf
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/241998.pdf
    • https://lilalosemojuwo.weebly.com/uploads/1/3/0/8/130814601/gadeteninet-keziliropad.pdf
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fe778ea42306.pdf
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/43432f52c.pdf
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/velomosobeliziviti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21b87464-4504-44b1-af62-54a695f0bd70/does_directv_have_game_show_network.pdf
    • https://uploads.strikinglycdn.com/files/fdd68aa8-82a4-447f-852e-0088915b65b1/what_are_the_easiest_computer_languages_to_learn.pdf
    • http://kikipudojuzo.pbworks.com/f/lirupekevalo.pdf
    • https://uploads.strikinglycdn.com/files/04de195a-72df-439b-abf7-22f570c0c547/why_is_there_water_coming_out_of_the_bottom_of_my_garbage_disposal.pdf
    • https://uploads.strikinglycdn.com/files/2f16f6c4-f03e-44f4-b5cd-73b27492c170/explain_the_4_main_principles_of_natural_selection.pdf
    • https://uploads.strikinglycdn.com/files/b8370562-fff6-4d9b-b03d-5273d432ff52/adobe_premiere_pro_2.0.pdf
    • http://fixulirulafa.pbworks.com/w/file/fetch/144492288/what_is_the_icd_10_code_for_trauma_history.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_off0000f472.bin
c2e180e743d4c507fcd0f5651f6e7fc0f82e85e2928f1ede4dca26a4a158bfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 5628 bytes
font_01_sfnt_off000107a1.bin
721df0bd5ab579a847544d4fbd2170f962c874168b1c41db3f8ebd17339581f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10976 bytes

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