Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7fe84ac930c079…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 18:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1aa118122d6709fcecca00e8e4d421d5 SHA-1: 8270509281dcd5c0f6b870c90b4a8dc8f346510a SHA-256: bf7fe84ac930c079d5af3055a61b9dd619a7729fd9f89f90026dfb1649063d6e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to product listings, likely serving as a lure.

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
  • 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://resalured.ru/strik?utm_term=sig+sauer+p226+holster+with+light+safariland PDF link annotation
    • http://xuxijosut.sportsontheweb.net/tetufe.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/fanosutu-poxikilovavega-kunerokiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_6037e13abc620.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/6b94b.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/dulebebuvokuvur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_603071728ee76.pdfIn PDF document text
    • https://mixunolonuwoja.weebly.com/uploads/1/3/0/9/130969204/3990918.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/2591205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fcf5d6243aad.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/gikagosifum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_600047f581511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_6010d01786bdf.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/foredabu.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/interior_designer_opportunities_in_dubai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5ffb91a15b4ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fd03ea72f83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fda28b83298c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_6015bd34302b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5784 bytes
SHA-256: f8cbe19ab0ab2c1eb80a950ae6186ce09437d70d1bf56e6884334012de1c7802
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 15380 bytes
SHA-256: 14e650547a6c023bd070ad52d88906b129ac504b68378462734dc79d11048237

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