Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2bd8235919897b…

MALICIOUS

PDF

67.5 KB Created: 2021-03-02 09:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8199fa28b11b53497ec5b817a4f91a04 SHA-1: 69765c709c81e3ba7ef7568accaa8a1683a4d462 SHA-256: cb2bd8235919897b76970fa750c48b0a3f07876ed0bbe3356f8450605b721fc7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=navien%20npe-240a%20repair PDF link annotation
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/9899069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_601b61bd6a90d.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/rinilasa.pdfIn PDF document text
    • https://xajifopuref.weebly.com/uploads/1/3/3/9/133999146/telazalovubamowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447885/normal_5fdf63c5003db.pdfIn PDF document text
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/detusatidupo.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/6580bf5f6dc98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6018538d6fb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601c5fcf8968a.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/rekawexuretowo/airmail_envelope_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/media_and_information_literacy_curriculum_guide.pdfIn PDF document text
    • http://mamitepibo.epizy.com/torizitidipigu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/16804113876.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/chennai_express_hd_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/19098749452.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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 5028 bytes
SHA-256: 435e3f9815787cf4dde8ccafb11a5ce89348d00fdc43499b165d39b3da2aba0e
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10300 bytes
SHA-256: ee8c4d6c14e5295476c8c84239711a9ddc7dbf1bd232be44cf2cc43b6e85e7b3