Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ba0f60b3e63b76…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 06:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3a404dfc56209b712d03c1b753f4165c SHA-1: 263f21ce9108a956abf47d6c8dfabe025a4b4ba3 SHA-256: f9ba0f60b3e63b76f9ad20414b5907d37b23d72e2e7d7ffe41161900218ca4e2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic. The primary URL, zajinet.ru, is likely part of this scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=baixar+livro+o+espectador+emancipado+pdf PDF link annotation
    • https://fivepixulata.weebly.com/uploads/1/3/4/7/134747110/5273527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fe7a5517082d.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/a261c929ebff97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fe7d7e29567f.pdfIn PDF document text
    • https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/2392480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_604aee49288a8.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/surese.pdfIn PDF document text
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/notum-wefuk-melekotufotox-delem.pdfIn PDF document text
    • https://panezoso.weebly.com/uploads/1/3/4/6/134697542/joveluxepilidupirego.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/4934893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6025e5ca64a06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_6008944295bdc.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/ca8ab134-e7c6-4e1d-9733-10407ff33592/45131329196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc50333-a320-4c38-a67d-e6298d9b5465/penny_stocks_to_watch_out_for_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c166981d-79f9-4f5f-9aa6-c049a2fbf7bc/74151384128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda15486-c494-4a4d-8660-599d1944d3bc/55516384748.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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5476 bytes
SHA-256: fbc266a4ce264407d97373e7ff904e8fdad91d9dd19488f47c16bda811797aa2
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 12884 bytes
SHA-256: ddf68b112c592ef97b6894b1e9984383ad88cde34ff19593533252f7a3e45d28

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