Malicious PDF — malware analysis report

Static analysis result for SHA-256 7796dab241811b58…

MALICIOUS

PDF

74.6 KB Created: 2021-03-12 13:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5b01d8e8d5f3655e6c9f85fbf808d892 SHA-1: 2455232c34860931a7e884c52debb89c8ba68667 SHA-256: 7796dab241811b584510476e4b3da02bb205ea82acb2286b3183c8eb8e795d66
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 0.9999

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://bologen.ru/award?keyword=equality+act+2020+disability+pdf PDF link annotation
    • https://cdn.sqhk.co/vufebevefo/gjeJwjd/surikesupozewiko.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/jdjbibg/baua_all_comedy.pdfIn PDF document text
    • http://xejevojesinil.22web.org/hot_cross_buns_sheet_music.pdfIn PDF document text
    • https://namoturobiro.weebly.com/uploads/1/3/0/7/130739164/8f9ca410dadac75.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/igeJ0ji/norepaloruwufov.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/4313742.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/al_fajr_clock_daylight_saving_setting.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/1Y7hfgh/44832462783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_1c0e777741394119bb6cf43726c362b7.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_2446d1211fd74977abe22a36a05ee470.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_d311cf0381be45a3aeda015031bc1abd.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_7bcf6032a80d43a98543ad3b8d749054.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_b6513398f37341079cd550234e5662de.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_59299a70cac94888b4ae14009785be4a.pdf?index=trueIn PDF document text
    • http://zupitatip.atwebpages.com/msi_890fxa-gd70_price.pdfIn PDF document text
    • http://derekage.epizy.com/14768879093.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/78623818371.pdfIn PDF document text
    • http://fizufanotujo.epizy.com/17677662282.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 5652 bytes
SHA-256: 01c296fd36ace1b5d6587eba5b9020c6c8e1879c67e59019b67ce7d57010d0bc
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10148 bytes
SHA-256: e468f4d6548a33cfed4402db910764c019e8e8ad2ca3d9a1a6cc621b45de2198

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