Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c6bf164959dfa…

MALICIOUS

PDF

69.3 KB Created: 2021-01-22 19:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a4e089c589979ef424975aeae49f29a7 SHA-1: e28a59780b4eb7ce559eb1337c55294c64d0f2aa SHA-256: f55c6bf164959dfaf9b1889b64bafa7b88bcadc9b0715316998133f886042ea4
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://seumenha.ru/123?utm_term=nest+3rd+gen+manual PDF link annotation
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/mofukapil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ff84d80a7c87.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/794619.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/1570010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fcf46a532651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5fe02f84d84a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fe344bf67d63.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/87912129378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff03f44c717c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5ff9444472474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5ff8993a5a46d.pdfIn PDF document text
    • https://site-1187467.mozfiles.com/files/1187467/rutufekugu.pdfIn PDF document text
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/jivitixofopaxiket.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/sokubujimivuseva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavubuseji.epizy.com/54391570619.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_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 5280 bytes
SHA-256: ef434032589b37c2bffeaeaac264ab4e1ab065f4b73f1099d83643bd7012a3cf
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10980 bytes
SHA-256: bca58cc12aa9f8f9c54995fb875a0ca43a9baf6c60b048caf7d48be90a66ef7a