Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ae04833ac85d0a…

MALICIOUS

PDF

70.6 KB Created: 2020-12-30 08:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08aeffafd1102b5549857f7ce8e67050 SHA-1: 9b39216272cb63f03f83b62fbb34fda8bde126a0 SHA-256: d9ae04833ac85d0a6ea0ccb45bea55363a8e4b55edd565fdadce43be935d7afd
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 external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a suspicious domain, while others lead to benign-looking PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness, suggesting the document is part of a phishing or malicious content distribution scheme. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=another+word+for+disaster+or+catastrophe PDF link annotation
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/jifotedenujabi.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/c6430d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f9dd9fddaa25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fe8532bdb393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8faaaa78973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe5aaefb6bf4.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/tidamedori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fa06389d7a2e.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/bededuxotulapil/learn_android_app_development_tutorial_point.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/swim_motivational_times_by_age.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/branches_of_home_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/zasoxenuxure.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/lofenuvovuxulubimo.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/fanizutitixazofit.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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 5292 bytes
SHA-256: b91e81e7d9198cad2a2676d3df96a7f0ab95bd3a5be43ceb224a378494642e1f
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10400 bytes
SHA-256: e99d0fb56d844e67aa5a315cd28a813ae6d223655dba6b504c6f91ef6b01d685

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