Malicious PDF — malware analysis report

Static analysis result for SHA-256 5690f8a51850dfaa…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 10:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 85f054dec1b47e7a8c0a198fe2d0bed5 SHA-1: 18917400152027aa4d066905210b948a6f422759 SHA-256: 5690f8a51850dfaa001975c1e0a71aa1735754cf41b94ccc4ff939238366c9d6
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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The primary malicious activity appears to be directing users to external URLs, potentially for credential harvesting or malware distribution.

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://dugedepap.ru/strik?utm_term=2020+coleman+lantern+17b+nada PDF link annotation
    • https://gefogujuper.weebly.com/uploads/1/3/4/0/134012332/durinuzisowuguwaruj.pdfIn PDF document text
    • http://bluebadgeform.com/94395963621wbrmi.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/mibufazasesejurim.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/debapulowa.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/cf64ea.pdfIn PDF document text
    • http://finonit.mypressonline.com/duo_therm_rv_furnace_for_sale.pdfIn PDF document text
    • http://fitnesspack.net/bissell_bagless_vacuum_filter_cleaningyd2v2.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://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_8557d80df3e54a709aa839ad27960bc3.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_57c9ee8953f6457eb9d387aa82903b5e.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_9e9f1a1de98d4eb48f6bdfe40840c3f1.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_3c4939c1268e424baa16c3dadc034712.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef53588-afbe-41fb-9c34-40bda4dfaf42/runigopivaralexanasawo.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_a4c9eefff6084e4bafb0a874ed702d95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6498cf8-334e-4649-81a9-ad7bc0a2a138/zafurapesubom.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_2a1187400bd4487792e0ec6669b78c97.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/customary_law_in_south_africa.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5096 bytes
SHA-256: 98988f9aab4b32d7b4d77e7558c023c6db1f8674a6320a03498353ed6738d360
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10336 bytes
SHA-256: 7b8bce80afe24b581a1ae9a451a4090cf4282af13d767605d0b17325f3bc4af8
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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