Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed4f73efbbb8a96…

MALICIOUS

PDF

74.4 KB Created: 2020-12-30 16:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 699089830e82aadf746349ffb012848b SHA-1: 97e6b1ba82c007e1bea18b498b4b308fb76a9ead SHA-256: eed4f73efbbb8a966f614812fe490f016d8bebd5e3a91fe00d70b10b3765b82c
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 0.9997

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://traffine.ru/strik?utm_term=game+dev+story+hardware+engineer+hire PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f941b4017bb0.pdfIn PDF document text
    • https://xanalefude.weebly.com/uploads/1/3/1/4/131411596/cf8b0d7946584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f9676154170f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fdbd26e7e98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fa52b628a1fe.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/ae76d7f.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/duzexefemosaxe/vosel.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/webijive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adc2b37-1e41-4410-910d-b587c88b1e0c/worksheet_acid_bases_and_salts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceec66b4-cdb9-4d3e-ad26-7c42cca69332/xigumibadokav.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/amiga_date_cuenta_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/my_ambulance_ep_13.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/dark_mode_facebook_app.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 5492 bytes
SHA-256: 041dc5498970dd2a6909bfaf26b571be4af5406c7001c5c358c9bad7aace89ac
font_01_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 10988 bytes
SHA-256: 8b068d1def19fc86a878971b80639a2dd2841406920df242a7fd99c7a6899a27
font_02_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 16244 bytes
SHA-256: 37bd064822a4139c5d8e3cdb2e2dd8d0ae9d956962f76839c9edaf1267f3d3f3

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