Malicious PDF — malware analysis report

Static analysis result for SHA-256 951eb550bae86156…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 21:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b162f0e9995c0dfcdb8dcf0d1d8dcbca SHA-1: b3942216348d859f8d8c7b824b57369a00ea58ad SHA-256: 951eb550bae8615641c0d3e14da3a6cd71bda5a121914bcd7eee52e75f73b4ea
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The presence of a critical heuristic for PDF SEO link farming and a high ML score indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that leverage external sites for further redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/123?utm_term=mistborn+series+christian+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5ffd9a2e800fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5ff82e3444b67.pdfIn PDF document text
    • https://sebazolilerop.weebly.com/uploads/1/3/0/8/130874482/ganupodonepo-xefet-xoviparev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_600822c549dee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ff7db3375aa0.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/5872999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490929/normal_5fefc87b82492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_5fdb3fbe6a56d.pdfIn PDF document text
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/2333626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_60164a82c1dbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_60019efc03ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_6029e24fc3aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_600202e0a1b93.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/1436285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_602a90babf27d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxokabebixe.epizy.com/11944736581.pdfIn PDF document text
    • http://dikekonigexixa.epizy.com/chronic_diarrhea_guidelines_2019.pdfIn PDF document text
    • http://volemefejosi.rf.gd/vewixigabizerazupeper.pdfIn PDF document text
    • http://ruriwujuvuwa.epizy.com/la_la_land_english_movie_watch_online.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/39394326976.pdfIn PDF document text
    • http://wajufuful.rf.gd/24019607036.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_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 5152 bytes
SHA-256: 48819e24f0db672d8b20ebe915e1fa25a7c727135fc05f07085135c6dc5b23ad
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10784 bytes
SHA-256: d3303671b297548f261282ffdc31a8630acc970fe082788ef00c51dd27783210

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