Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a61e46f04773ead…

MALICIOUS

PDF

79.1 KB Created: 2021-06-02 07:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04870386c23fc509ee42d1fe30d5d491 SHA-1: b07794f277a982813dae69e74f19ceee817c4b63 SHA-256: 5a61e46f04773eadee9289d63e42c00fcef6eb9a7a412a83a996d260690fd94a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a Beethoven piano sonata, likely to disguise the malicious nature of the embedded links.

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://pistant.ru/pbw?utm_term=beethoven+piano+sonata+no.+15+op.+28+in+d+major PDF link annotation
    • https://mumotajesok.weebly.com/uploads/1/3/0/7/130738730/e5e662fb8eeae83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fe874ec88eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6062b10646ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_600e22411a8fe.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/sipazukiwafubagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_6059763bd497d.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/ec097418b2702a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_605c3b8ebf091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_60340699abd1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fc75e56e23b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_604cba99a0e68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ffc3605293b9.pdfIn PDF document text
    • https://faxororawanemo.weebly.com/uploads/1/3/4/2/134235350/bipopanilujus_tovebamogomel_vutemer.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/zamawifuvevutuver.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/93d5509b-94a8-4c38-9e05-95d60fb0b3ba/my_friend_dahmer_trailer_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0dd439-185b-4878-8fb0-6a6cb9e09de0/11730696305.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/lonijetakokuzikiziwiku.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144489708/biwijiwir.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 5888 bytes
SHA-256: 7de3d60bbcfc924dd930cc7b94e2d04c3330c6c088666fe82553c168a72c33dc
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 11720 bytes
SHA-256: da831b4bc6e9c0f60a6395f846522a6e9f9727b7e8cd6f3c2545702c7b59a73d

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