Malicious PDF — malware analysis report

Static analysis result for SHA-256 22013397e2e4d095…

MALICIOUS

PDF

71.1 KB Created: 2020-12-17 23:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: be46cd43816045a8af82143f001fa41d SHA-1: 9e81a199a92e18fda5282e8d457b50572a5a395a SHA-256: 22013397e2e4d095acab15e2c124efddb61c4aa230e45af1351085279b742fed
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a PDF link farm. This technique is often used to manipulate search engine rankings or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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=green+tree+frog+tadpole+life+cycle PDF link annotation
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/jepif_galawavosag_madofogapemet_situnofigukisok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fa1b769399d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f9f285de036c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f88e91f5121f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fce6469c054b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5fb5231d2ef6d.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/punagilelabon/avatar_3d_movie_kickass.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/45305077272.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51f70f7cf8c7540462545/t/5fccc212c836a917f90a1e61/1607254547761/agar._io_vs_slither._io_vs_diep._io.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/gujalisefusevuvor.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/3575841327.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/sentinel_event_reporting.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 5276 bytes
SHA-256: 01ea5674f015112ff56d5e1fccac70cdb651a5dd1f3442e3718741721f30c0a2
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10140 bytes
SHA-256: 8df76ae101d49c7297e0a1661c3e7d439c75dc5fbf9aa08414667a5b58197639

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