Malicious PDF — malware analysis report

Static analysis result for SHA-256 9661416012fe3bf5…

MALICIOUS

PDF

84.0 KB Created: 2021-03-19 23:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8f70c61a81e4caf22f1dcbfebe167147 SHA-1: 1501682f8dc2187c8559028d2b8071d517a7b01f SHA-256: 9661416012fe3bf5b3ba32f4abed6b1f073f8b78a7534177de9f6a52886f4181
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=backtrack+2+final+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426816/normal_6049810e7a3f2.pdfIn PDF document text
    • http://subakegewoje.sportsontheweb.net/63346633119.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/is_wolf_of_wall_street_a_true_story.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_603da31e731da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_600ca691c2c62.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/77728169388.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/dojanojipirorifadidofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_60272afa838dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5fff1afbf1740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_6039b5924882f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_5fe62f7919562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_601af80e1bca4.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/95062129589.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://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_107997757ac543d3a8436f3b39406264.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/advertising_and_sales_promotion_in_marketing.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_7b4ba28e82fe45c3ab25ec12849b7f08.pdf?index=trueIn PDF document text
    • http://dufobirufo.atwebpages.com/lepurujivukojukitivut.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/metal_gear_solid_1_pc_cheats.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_21666c38b6d6430b9bae440ba160de7d.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_9c716fbc1e364109af5f954c1f189a0e.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_07856c41f21e43bfae5a8e7aa36636a4.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 4788 bytes
SHA-256: 060d7bdf1538d790b2912dbaf2b44f9236f2e9f6accbc506000535174daac0e2
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 17232 bytes
SHA-256: 3cf4eacf9df91360903e7e7852ffbcfaa8529f4e9571b1900fcf42a9af855827
font_02_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34