Malicious PDF — malware analysis report

Static analysis result for SHA-256 881817c3e0c37857…

MALICIOUS

PDF

70.0 KB Created: 2020-11-17 11:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 02813319b0310a5c5f0f66b216c6e297 SHA-1: b9985882ed9da99b818329dd9ade18281922f764 SHA-256: 881817c3e0c37857590b90bff606cbb2b248d4e08f3ff5527d030310a6ab3486
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a significant portion of which point to known malicious redirector infrastructure and a link farm. The document body, though heavily obfuscated, appears to be a lure related to 'Curiositystream documentaries free'. The presence of multiple external links and the ClamAV detection strongly suggest a phishing or redirection attempt designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=curiositystream+documentaries+free In PDF document text
    • https://zenuxemevobimog.weebly.com/uploads/1/3/4/7/134756414/7d263f823b2.pdfIn PDF document text
    • https://nipezititixi.weebly.com/uploads/1/3/4/6/134688951/zadawegugif.pdfIn PDF document text
    • https://kenodajeto.weebly.com/uploads/1/3/4/4/134490943/visetuwawu-keluwovodi-gevozu-zugote.pdfIn PDF document text
    • https://nilorajokurede.weebly.com/uploads/1/3/4/6/134626806/duvotipezubewaz.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/68f62826-d3df-4b0e-a706-77027ad2c8e5/scarlet_pimpernel_questions_and_answ.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/tennis_roland_garros_direct_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3bfbf4-814b-4753-821f-704761a6a5a7/reference_letter_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2ca77a-b92b-44de-bc96-2cfb90c26472/cwb_welding_symbols_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/35909352540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7eec23-539c-4573-ac6b-206283d7ec8b/lunizipulaledabunofitax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977db702-a3e1-4ac2-952e-491bb811575a/70729702865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c774c9bd-673d-4409-ad0a-4877bf017291/zumoturam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cc3eed-1639-4fdd-a383-f77dfccfc04d/folodilemabimesowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e7354e-c35d-4530-97a2-d2d528e32bb9/jlo_diet_pill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d9602e-6690-40e0-8c69-64bf2a0d8b7e/zaliwozekejigojuwufesufu.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 5140 bytes
SHA-256: d3cdaa7ee5b97aed967de38117fd88e3816c7566526070f349f2d83aacaa5db3
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10824 bytes
SHA-256: 2b9b19345ff15f280a80e143280770d8dfeb00488a848fd181a0d319a9fc4d12

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