Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58b28731f89f322…

MALICIOUS

PDF

73.0 KB Created: 2021-04-03 14:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 01505550bf1e1f411df6f2f1ad61d631 SHA-1: 909a55f16eacdb14551a97f26502683b61ca7b1e SHA-256: d58b28731f89f3220f193691ee96844efbf0135235019beee1cd7088bd979c8e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wix?keyword=the+heron+nest+prince+rupert PDF link annotation
    • http://trikotoria.ru/58140196000r663s.pdfIn PDF document text
    • http://petonopelun.iblogger.org/2888055063.pdfIn PDF document text
    • http://lishop.site/11238325394k3w1g.pdfIn PDF document text
    • http://ewwe.space/baseus_encok_w01_user_manualiepd6.pdfIn PDF document text
    • http://help-copyrighteamservice.com/jifesawavatijafalet23kie.pdfIn PDF document text
    • http://nextauto02.ru/17700356892681ry.pdfIn PDF document text
    • http://detomebokiv.iblogger.org/how_to_use_kobalt_portable_air_compressor.pdfIn PDF document text
    • http://mesretly.xyz/94065107775kxk59.pdfIn PDF document text
    • http://dress-russia.ru/94548493588uoto7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_6454b9d20d6b449c8174b6f3f3a60d12.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_eca2cd46c1fb4686a43fcb5546976c8b.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_b2f6a1d949ba431cb3fff225968ba6b0.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_cd31b81564254a5e86a6f98d6feea8aa.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_573c0f1bb1394b97a9498432e36e3942.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_77940f23d13648caa1ce23221353be0c.pdf?index=trueIn PDF document text
    • http://wapofele.epizy.com/fuentes_de_contaminacion_atmosferica.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_28c1a48eef54411785b039b0c19cc85b.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_d0bc64a57c574be88068435cc5650739.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_ccf9c04e036547fc9385cbb216d3da83.pdf?index=trueIn PDF document text
    • http://karapazixegipi.epizy.com/25429310007.pdfIn PDF document text
    • http://dobejevilorizu.epizy.com/createspace_independent_publishing_platform_phone_number.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 4612 bytes
SHA-256: 61e1ad8fb9310c49e88eb2b7038aa8b4bf23a86b1b2b9bc772b472fa000904a4
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 10860 bytes
SHA-256: 9e9c0073efdcc06764ab769e275f83c159d55b557e61014d51f85ab2b070f532
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f