Malicious PDF — malware analysis report

Static analysis result for SHA-256 941da5bf5736a7d6…

MALICIOUS

PDF

74.7 KB Created: 2021-05-19 23:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1676d9d3127a919f031b1d64b06d8c4 SHA-1: dcc547288103c66fc347372cb7687d43b5efd0b5 SHA-256: 941da5bf5736a7d6fd08e3be92ea46cf2cd50bf09413fb38afa57f47cc5a7c69
156 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 0.9996

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 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.
  • 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://zajinet.ru/strik?utm_term=ac+market+apk+cracked+free+download+old+version PDF link annotation
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/nokekinevodug.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/werexigi.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/zujemu.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/rojovuku-vidalezapopow-tezidizebisu.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/19020.pdfIn PDF document text
    • https://naxejewosusubet.weebly.com/uploads/1/3/4/7/134749601/tupubuxe.pdfIn PDF document text
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/pefezigakularom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5fe18580091f1.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/fatezikuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_60301092e3f3a.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/1b5e87c302417d9.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/sijotow-tejosoduva.pdfIn PDF document text
    • https://jeruxonoja.weebly.com/uploads/1/3/1/4/131407493/3069427.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/worajuwegikubudafej.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/e015d.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/gagagakigibapo/pasaviworasixabuki.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/microsoft_access_computer_inventory_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/birth_announcement_template_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/dirikopupe.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/balemojeganuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/property_inspection_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/pewepe.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5508 bytes
SHA-256: 3bae6ff9c71462d97522258767ba94f30edea1a12c38057497447e8ea3b86b4a
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10480 bytes
SHA-256: c2b2f97f495945bd089cdf45e0ce7125216d15b9bbd3864de8cf96ed04be4482

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