Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b4be6ddc9846e5…

MALICIOUS

PDF

68.3 KB Created: 2021-02-18 15:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7b80b68483d25764e5f23ffd71314cfa SHA-1: bf0ce140239d7571f9605f8bba1be07be5875224 SHA-256: 24b4be6ddc9846e55bcd670e9f3c231e1e4dabf74c3d77f19988d35006ceb305
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=auld+lang+syne+meaning+youtube PDF link annotation
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/vusisusaresodi.pdfIn PDF document text
    • https://damupose.weebly.com/uploads/1/3/1/0/131070457/4616547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5fdee5de824ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5fcc136c23017.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/8235677.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/surefiro.pdfIn PDF document text
    • http://bbflowers.net/10016061135xi7of.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/transformation_of_quadratic_functionwd56z.pdfIn PDF document text
    • http://thechambre.xyz/fundamentals_of_communication_skills9dkgn.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/zepamixafo.pdfIn PDF document text
    • http://yazansoft.com/kafufuxirkk24c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_601722b187b5e.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/90b9d6ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_602cfc19ad76a.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/4e646.pdfIn PDF document text
    • http://exampl1214.com/rekebojeokod.pdfIn PDF document text
    • http://1ux.site/taxofulemizujarudenumungq9it.pdfIn PDF document text
    • http://stalekost.site/puwafegixobelo20u5n.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/dejawatodaxixa_vamozabeduf_wonil.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/vibuvomomuv/capitulaciones_de_granada.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/guided_city_tour_dublin.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 5280 bytes
SHA-256: bfc8f9b80ce99f4ae901d8c6c3373ef8f1aa318d9294e49026f82cf4e3c42bd2
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 10824 bytes
SHA-256: 5bfd5b084ba3d6b7d4181f6d2d91091096e8bef2e5e12f5487f82741362986dc

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