Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccfd4c25f6e4b48…

MALICIOUS

PDF

61.9 KB Created: 2020-11-25 22:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: de0fad6503fb10534e92681c6b1944d3 SHA-1: ea5ed28a70eecdca8d9ee6b5e6d071a3b2fac0e0 SHA-256: 0ccfd4c25f6e4b48c81ec89d5c87931403abb38ff196bf5882ce6c01e9adba3c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a large PDF link farm, suggesting an attempt to distribute or redirect to other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=physical+change+vs+chemical+change+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fa2084527a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5f9204b71d9dd.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/8737189.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/juvuraguvutoxif/accountancy_class_12_book_sk_singh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4725390a-9f75-4477-9974-6a45669a1f27/tuvijutefukumijapoki.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/powerdirector_full_version_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/earthbound_rom_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/advanced_trauma_life_support_9th_edition_free_download.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_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 5532 bytes
SHA-256: bc74691a92fb04436b8f55e6407383f879af5dbd54c611e49d0da9d6b1820d5d
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 9784 bytes
SHA-256: fd8bc4348deb1a0258931d535880b0d7002f662d0d503749578610a9c28b557c

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