Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9acb257459dd8…

MALICIOUS

PDF

83.9 KB Created: 2021-03-03 03:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a662d3103871d0cef9df02eee59576df SHA-1: 812fe1fc5b765f51728f5cd7be74b14f9a161ec7 SHA-256: 9da9acb257459dd8211beb785a0343d6dcd506f015c00eef670c7cae3e270a6f
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily corrupted, contains text related to a product listing, suggesting a lure to entice users to click the malicious links. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/award?keyword=panasonic+kx-tg7875s+cordless+phone+bluetooth+link2cell In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fcc2d391b846.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/ig3igYM/gevobutigulaxamilifasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fd682df4c3c8.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/dufoluzo.pdfIn PDF document text
    • http://xebupado.mypressonline.com/craftsman_yt_3000_46_inch_deck_belt.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/runiditetaragafukixibewo.pdfIn PDF document text
    • http://kleomaften.online/lusukadozazk913g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fc94a3b9be14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fe82563a98c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/5vzgdha/how_much_space_needed_for_6_chickens.pdfIn PDF document text
    • http://profmaster74.ru/5018557102vw426.pdfIn PDF document text
    • http://shoop-fe.ru/central_de_incendio_intelbras_cie_1125_manualoktmo.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/jcjhajh/52688706608.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/telezugabelasokotesuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/65575825272.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/77347399567.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/15711541302.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_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 6168 bytes
SHA-256: 4d4107d99792bbfcf0e3d70fc00c7261156cebe8fb19da60a2ce1666e8a76fc7
font_01_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 10824 bytes
SHA-256: 0e548129115739720f030491f731f97b0165a9616bc4b2e7c064f7a440e81820

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