Malicious PDF — malware analysis report

Static analysis result for SHA-256 665d4ba022660bb4…

MALICIOUS

PDF

90.0 KB Created: 2021-01-04 10:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ab7b27f2a2ae4542962e40134713d323 SHA-1: acdb85d326186ffee3bd4898e78672a9701c381b SHA-256: 665d4ba022660bb4957495a9275c9eb1c1ded2b512058f6d43c4e1172fc7f85a
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, and the document's content is designed to be a lure.

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://traffnew.ru/123?utm_term=biografia+de+jesus+adrian+romero+en+espa%25C3%25B1ol PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/52c71.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/mileragaxota-paxenidojud-lonekot-zezivujokita.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/xuwafewesevit.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/jjjhfOy/alter_ego_game_endings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5fc676dd3c876.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/0nhbb1Z/retrograde_october_2020_pisces.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/fimaselaso-pevipe.pdfIn PDF document text
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/rarudimibasubugiwu.pdfIn PDF document text
    • https://divewamekavese.weebly.com/uploads/1/3/1/8/131860060/8844763.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/3177600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acec36e4-c646-4e10-971a-7587c205f8b8/the_maze_runner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0aa9f3-c396-4030-a2d4-420734189fe9/17280702154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c5c9ff-d2d2-4711-9758-a6b8783d49a7/as_institutas_volume_3.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_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 5696 bytes
SHA-256: 33cef1c7e6e90268cdb5d2fedfb07bc1d1384bdfa80185afc860e818e8055647
font_01_sfnt_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 12176 bytes
SHA-256: c43297f05031eca003404f353321280f51b2c14962aaebce00cc2d40de10cb2d