Malicious PDF — malware analysis report

Static analysis result for SHA-256 167916bcfb3e56da…

MALICIOUS

PDF

82.5 KB Created: 2020-11-23 08:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b59efe5899db5a40dc26c4512f2d1585 SHA-1: eb01b96565b9015219a37c8644049a49faa34637 SHA-256: 167916bcfb3e56dacbcd84e376732da19ca9769b1f142a12590519d996f83c0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains multiple embedded URLs, with one specifically pointing to 'trafftec.ru' and disguised as sheet music. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

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 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://trafftec.ru/aws?utm_term=beethoven+piano+concerto+no+1+sheet+music PDF link annotation
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/robilamile.pdfIn PDF document text
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/guwelanub_jubizod_nomotexupebed_wozotopado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fa45b217c933.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/navugod_jogunereri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fbb35fc489f2.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/7931f5a29.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/39bfccf87565.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/wegemebufojafak/the_longman_writer_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18009179-41f4-4d65-9070-f562c92a09a7/8866077754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc120b6f-3357-4201-964d-9454c0de900f/gelorobarununovagotet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd47e1a-7a25-402c-85e0-aeb3ccd14a77/adobe_cc_2018_crack_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0859bf-70d4-4ba7-839b-aa890c6632b4/toriwudedopevaxoniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6614840-e935-4576-9ab3-3fc9298670a5/army_national_guard_suta_request_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158a473e-e47a-4a09-aaa3-b6bec9f69a45/xibinuse.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/advanced_data_structures_and_algorithms_books.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5300 bytes
SHA-256: 0a66914aceceff018f0ccc5c34ed10f5ea60fc5e91b31777301fe3d3bafbb861
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10784 bytes
SHA-256: 47991f948f98bd151758353c6fa368135b1de6d39a10420b9f8be53a2db916be
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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