Malicious PDF — malware analysis report

Static analysis result for SHA-256 259adce0b5e0e27d…

MALICIOUS

PDF

96.2 KB Created: 2021-01-21 08:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21bacb12d2a54a943c74d63861e76094 SHA-1: 810d52ea2d0e8c964f0490d5ae07b6ae0a967ed1 SHA-256: 259adce0b5e0e27d03bf6d3ef0c90e88bbbcd9bea104a45a0542383c674cd87f
192 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. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/123?utm_term=mini+practice+set+1+service+business+accounting+cycle+answers In PDF document text
    • http://sizijevoji.iblogger.org/fogupagiwuvolinirinamabin.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/3a9zNjj/46604008804.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/academic_games_equations_worksheets.pdfIn PDF document text
    • http://purigoguwoz.22web.org/microsoft_windows_7_antivirus_2012_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5ff514c21cc16.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/zevavemojawuxet_getitamixuzide.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/30926837782.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
    • http://xigilozixorod.epizy.com/pitiloselibiravemuwuved.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/94460197326.pdfIn PDF document text
    • http://nazifaba.rf.gd/vanilla_wow_herbalism_guide_horde.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/42600633533.pdfIn PDF document text
    • http://badememaveg.rf.gd/sm_bus_controller_driver_windows_8._1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 5432 bytes
SHA-256: 1103499e8506737418dff8675cd0e557b6655ffe9699442124b6ac65f24c3f66
font_01_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 10852 bytes
SHA-256: 3a06db512a6e9532ee569e95b21424c9a399d71e741d0765ea75268e4161c28c
font_02_sfnt_off000164f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f