Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de15d264a80cdb6…

MALICIOUS

PDF

83.3 KB Created: 2021-03-08 07:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c8593e1d2a9ed3a512443ab9ad288767 SHA-1: 4ebf20be90f3fb1d23c748a8a0bc2a060875230b SHA-256: 9de15d264a80cdb61a7fe786eac60a4ec67330030a49a078ad95785e20952809
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a search query related to 'Wendy's frosty ingredients', likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/strik?utm_term=what+is+wendy%2527s+frosty+ingredients PDF link annotation
    • http://peuly.xyz/giruvoarh7p.pdfIn PDF document text
    • http://unonatur.space/zifuzumfay.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/ghjhQBg/71308808583.pdfIn PDF document text
    • http://hookup158.fun/72329085031fmtds.pdfIn PDF document text
    • http://hookup153.space/algebra_2_workbook_mcgraw_hilld92jp.pdfIn PDF document text
    • https://tuwukodazoj.weebly.com/uploads/1/3/1/3/131383678/bivijinabofovifalane.pdfIn PDF document text
    • http://smallita.space/164105320633ycyq.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/gchdie6/zombie_catchers_hack_level.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/TTNggdF/death_breath_smell.pdfIn PDF document text
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/lagufuje_nikakipux.pdfIn PDF document text
    • https://fudakima.weebly.com/uploads/1/3/0/7/130739810/567b49e456a03fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_65bad62c90b94c5aa30ddf6a19ba1715.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f20ab25-cf2b-4c35-bdf1-3e338660cdac/kusesaxurowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43d0874-6225-4573-88f6-63aeeab91c0f/shell_script_example_run_command_and_get_output.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25ca36c-8afe-45a8-a59a-c594dd2e0c4b/briggs_and_stratton_intek_repair_manual.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7b0e7aaacc4d4596bbc276d4977017a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/432a2419-29bd-4082-a06a-5ceddf7d9b03/la_biblia_app_gratis_reina_valera.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_8d64e969616348daa5964de13c281689.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cd6b0f-5726-447c-9a3f-0f8f78cc9f9d/tri_state_bus_midway_to_highland.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_7ed9c4b7b5224e568c7c35b0539eaf07.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_0045bb1ff7c34720a886f1ee169403d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66f8a5e-125b-458a-8f94-648487d819d5/domokixaduxuwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75f57e8-3274-465d-9310-918eed74ea76/82384206267.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5168 bytes
SHA-256: 373c360e9f665b73c7c6160d2e97b26c369d95ccb80f15cb79212cfdaeec6ad8
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10700 bytes
SHA-256: 4a946f4962f018bfdf04fb8c2109fe6a8c8da7887cc3c4f7b6c44596bef3aadd
font_03_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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