Malicious PDF — malware analysis report

Static analysis result for SHA-256 63332028754af95c…

MALICIOUS

PDF

71.4 KB Created: 2021-01-07 04:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd0d183c0ab1a5079fa4af98cc154c67 SHA-1: ebbf95e008fc584d4c504b659a4300b790deb026 SHA-256: 63332028754af95cccdcbfbdab1df1ddf3b9f9c9a6dead5a6726641c901385fe
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a mass of external links. One of these links, 'https://trafficel.ru/wb?keyword=linkmenu%2058%20vilnius', is flagged as unknown reputation and is likely the primary malicious destination. The presence of embedded URLs and the ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

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
  • 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.
  • 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://trafficel.ru/wb?keyword=linkmenu%2058%20vilnius PDF link annotation
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/56b3144db8.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/zovuwano-nepojemip-suxumemisozoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_5fb4ecf9e6ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe2d1f6983da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fb487728372e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/jokes_funny_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207db681-d77d-4fef-9587-04a11762b4d6/japorazogeximixitulimajot.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/bimubedasimogubezup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ab6953-4601-4f37-b974-0473bf08853e/dotopugemaniwizokofaki.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/bikopojaxabavuzike.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/wechsel_steuerklasse_arbeitgeber_informieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862f6c4e-2c62-4c22-8e4b-ca686876f84e/timeledibakikoravesumosol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4051d0e4-3fa1-4a8a-88ac-e22cb19059cc/fresh_ideas_for_womens_ministry_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866934d3-702c-4e4d-bbda-a906c87f7168/davobaretedebawabutuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/40770036778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f04b6a-f562-4dfa-9a87-84630baf6f98/strong_acid_and_strong_base_list.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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 4908 bytes
SHA-256: fe88479da7920f95c72f16b6c60f9820831673daf840b08eaa0f2e851265c3f3
font_01_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 13228 bytes
SHA-256: 0e1be09ddba9508a9cf52214006944c9790c9fc35ddbb0a34bb74984f63a8582

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