Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490de62d7fe3aa8…

MALICIOUS

PDF

90.4 KB Created: 2021-03-22 13:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8456846e31bd2e8dd59466a4cef7de4 SHA-1: 512f1e34998547a67be107216aaa12e4a07276fb SHA-256: f490de62d7fe3aa871c6e0bf80e8aba834d8891b5796c17b368a9225fa76aeac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, indicative of a link farm for SEO manipulation. The primary malicious URL identified is golowaki.ru, which is likely used to host or redirect to a malicious payload. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=achievement+test+in+mathematics+pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/7833796.pdf
    • http://berozava.iblogger.org/basato_3_manual.pdf
    • https://benedelewerovil.weebly.com/uploads/1/3/1/3/131384674/bofumubilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_696637e7a2224ddaa06465cf4d955e3b.pdf?index=true
    • https://s3.amazonaws.com/miledu/50214273159.pdf
    • http://fojamemu.epizy.com/windows_7_loader_application.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8c304fcc45ac400f9faefa7df711489e.pdf?index=true
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_10e97a9cd7394ac7aae514adf53d0328.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_06a2714c41d14ba4a5aa096fb4974a65.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e2a6a8c-052f-4d99-bb7a-06e23437aae6/how_to_use_stanley_staple_gun_with_nails.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_91749664fe4d4b069868336fb171a841.pdf?index=true
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_acb4967c9a844c27b2c9dfd0d326381b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20e4a57d-03e4-4c49-ad19-eca103ea667d/chemical_components_of_coconut_oil.pdf
    • https://cbadd540-9243-402c-beff-1b38758e3779.filesusr.com/ugd/cac9e4_134897bf80e44c82b31676333a18a1ab.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/45142353592.pdf
    • https://s3.amazonaws.com/geradi/gcuf_date_sheet_2018_ma.pdf
    • https://uploads.strikinglycdn.com/files/a1d509be-7bbb-4761-8cb0-20dcee5d4564/kavowuxu.pdf
    • https://uploads.strikinglycdn.com/files/969b9174-04d8-4907-ae94-775bb3b3fdf4/gulubiwusufiwirewifolaga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123d3.bin
431a456f95dad5ee7d3b8ad45ac8307698cf7eb0a6db3d3a5c3a7e981f62e7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 5316 bytes
font_01_sfnt_off000135d3.bin
4069361fea3b1149c445ad24dc8294b0ff1bf70613b5686844d6e7804e6d1ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 11344 bytes

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