Malicious PDF — malware analysis report

Static analysis result for SHA-256 49de5c2892febe67…

MALICIOUS

PDF

75.0 KB Created: 2021-02-09 20:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 476026e9802ddf992d508b437b5bab6b SHA-1: 850c28b4a45dbe78bfc64529aaabc8efd712aad3 SHA-256: 49de5c2892febe67a80acfc0da47d38cbec48373428308494143cd9cfe8fab59
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://jacksth.ru/wb?keyword=math%20coloring%20sheets%20pdf PDF link annotation
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/fikoxote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482018/normal_5fe31284be1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6013c9e7dc532.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/hjgiuii/7364247756.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/heLDljh/hydro_dipping_shoes_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458161/normal_6005e5ad6e2f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_600e0b57131b6.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/pelito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5ff3d1d97af95.pdfIn PDF document text
    • http://normab-id.com/jesumebugfhi7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5fca4c534784b.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/idibCjf/xixixusojuburuxogonatofiv.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/lumixi/lezeberofo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/brunei_visa_application_form_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/manualresetevent_waitone_not_blocking.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_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 5424 bytes
SHA-256: 87c9627298406cda2a5c7cb29089d6d733633502d298b7f99755de1e1ec1f575
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10596 bytes
SHA-256: 5933161475b5e3d46a7d94fcd0bf410f1ccce03d3dd8a61e25fe8ead7848cdbc