Malicious PDF — malware analysis report

Static analysis result for SHA-256 a198aa68bfd37a70…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 13:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d2531c97d227891acacb6d111bee8d1 SHA-1: 5c333271b6fdf997eb982ec5c401663cb53c5828 SHA-256: a198aa68bfd37a706ededf2aebfcad41bdbe4431f75e015aac1e6ffa339c85fd
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://pelibifir.ru/strik?utm_term=the+canterville+ghost+and+other+stories+oscar+wilde+pdf PDF link annotation
    • https://cdn.sqhk.co/nogorodizet/gc7jigi/47265520371.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/dodisagugufisejo.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/WFChgRV/5581284260.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/95516414793.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/kujapomib/14484881804.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/jamufezodexi.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/marvel_spider_man_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6514cd23-3f15-47f4-93e6-641b9831ada1/91626375987.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/burelewokasowavigilajez.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_385e098ccfd146adba9b91e7993e70d6.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_82ffa5eb47c248d99530e99fdcfe0457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/xixuvetixogilijodevurigon.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/66490891829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0032d2c-d0e2-422b-8767-fb5e6feb9062/kovaxiratapixuxenovor.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/teco_7300cv_error_codes.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/bending_moment_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/bmw_320i_2005_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf5d246-e3e1-49c3-9f17-86c013293384/finekotigalevom.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/ethical_considerations_in_secondary_research.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_6dbfaec2dbd94bc1a5ce983d2e19772f.pdf?index=trueIn 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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 5520 bytes
SHA-256: 224a0100e5584e700aced78bdab6b5c9f3329cc8e2fd82dab0d481310d7c9f80
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 13520 bytes
SHA-256: 7b8df0b3f6a9d0c00037e9624bd0815106e2f5383c9deaca3dda7c728d585162

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