Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b08f9ba3c6b15f…

MALICIOUS

PDF

65.2 KB Created: 2021-01-16 20:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cae82534beb137bab3e39f8f820a166a SHA-1: e983ef0017a3c9762fc2309e2c31612372990df4 SHA-256: 36b08f9ba3c6b15fb4ef9fc93a613ba6d2f1a49647f9e6905e50d8078c934193
206 Risk Score

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. It uses a QR-code lure. 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 0.9995

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trafficel.ru/123?utm_term=moto+e5+play+case+ebay PDF link annotation
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/bbec6.pdfIn PDF document text
    • https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/39b83b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/fsgmJia/tipurevanelajedodonitinok.pdfIn PDF document text
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/fuvefosixi.pdfIn PDF document text
    • https://site-1180454.mozfiles.com/files/1180454/cancel_livephish_plus.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/munaluvomuxagibuxidigito.pdfIn PDF document text
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/4905d41.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/ZHdF4wb/robemujote.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/wekipiluxezesomizeni.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jhijism/febuxuruporosafobidiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 5204 bytes
SHA-256: 53eafcda6ed2745aec6fac280170d61469161572010afc07ef0651e87b2d34bb
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10164 bytes
SHA-256: c61a00e5d21ac7aa13e9e2eddebaad4442214041cba1c8cfa053ce2ba6dae475

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