Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fc04d5447a3601…

MALICIOUS

PDF

78.2 KB Created: 2021-02-17 00:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3ac0c0fa213ac8742b3ebd0a0a8851cf SHA-1: 9cf988472e4045e6e7115337f1d36673c60fa6af SHA-256: 20fc04d5447a36019f458abf88469117a3cc0003ee71fbcd7ded4468a24059d2
214 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded links, with critical heuristics indicating it's a malicious redirector and part of a link farm. The ML classifier and ClamAV also flagged it as malicious. The embedded URLs, such as https://crophysi.ru/123?utm_term=william+wilson+edgar+allan+poe+pdf+fran%25C3%25A7ais, are likely used to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=william+wilson+edgar+allan+poe+pdf+fran%25C3%25A7ais In PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/biranivasuzilununi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_601d992975a04.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/vagaf_liwalozumotex_regosedunivibi_damimozexofom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fe51c29ea0fd.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/jesefololofan_muxidolanur.pdfIn PDF document text
    • http://wellwork.site/582064247228jeoo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5fc6305552339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_60106a8f11f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60148750dcd07.pdfIn PDF document text
    • http://idclick.cash/busowunupavabavezikamo4xz6s.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/fixararololu/gunajaze.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/tajet.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/basset_fauve_de_bretagne_breed_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/51891145146.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/rerifagubenojewutagoteme.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/coloring_sheets_flowers.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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 5648 bytes
SHA-256: bbc8cbbc5f2f27666220d67bc1542335316eff79af40a6e0b1c323388e6fe835
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 10856 bytes
SHA-256: ebcf7f731a08c6f69c72f8f17b8dcbb2b41f926a7a606e6a2844471e0b51d725

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