Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d6d0057672bdb…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 02:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a63ab6103475739ebc0c3893e8020cf SHA-1: 321b26dda53dcd3b5de57bbbfad9bc7caef4456c SHA-256: b15d6d0057672bdb948a93eacd3ff1afbda0ccb9c5f0e5e182a1ab1f750af9de
186 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 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 0.9997

Heuristics 6

  • 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 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/strik?utm_term=how+to+update+nakamichi+soundbar PDF link annotation
    • https://cdn.sqhk.co/xivorotil/LCkcgjf/oz_prince_run_mod_apk.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/932088.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/fuxab.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/d759b98240e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448740/normal_600675c9657e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388162/normal_6007ee4a00431.pdfIn PDF document text
    • https://kofutisidizeb.weebly.com/uploads/1/3/1/4/131437743/bumadozubez.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/ijhfha6/sumoxom.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/6310283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe8e56424dbe.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/5e698307d00.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/f852db2136983a.pdfIn PDF document text
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/zolapibiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5fd67103ec0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6043ee6c0188d.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/bieUmdg/24968670152.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/lavutoxapiwiposizabu.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/2013477.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/0ggWUii/wijotububil.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Jjim5Vx/95148858648.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5536 bytes
SHA-256: a61be0f79ba9e8f64f03209ea01c5cb3513dc7b0b6346f31391f13882428d447
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10944 bytes
SHA-256: f236197490d73a85e2d2ef721c3e1012ef816cad11d03a7b1492b7d0abe75e3d

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