Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f836375f4ba8cd…

MALICIOUS

PDF

81.0 KB Created: 2021-02-23 16:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e11e1f66bc5d4196eb14dae6c70a54a SHA-1: 27b88b4b68c5a94b3372a3b5a9e8620ce6af5e8a SHA-256: 59f836375f4ba8cd02aca66b33c90c02a7593f4e5f3188494d7e5832b90a31be
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=beats+by+dre+solo+3+on-ear+wireless+headphones+-+matt+silver PDF link annotation
    • http://opendouche.xyz/distributive_property_of_addition_worksheetsg5ksg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495858/normal_5ffdeb2e18f3d.pdfIn PDF document text
    • http://pycnidwzxc.info/66066161564yakpq.pdfIn PDF document text
    • http://moitender.org/funugumawakorombz9k.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/535097603587cgez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_602743a43ae3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc6c915524a2.pdfIn PDF document text
    • http://scm03.ru/bose_companion_2_series_ii_price_in_qatarybs01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fc7dd2e025c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_602a3b02dff5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_601ad1fdccf1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugetuwozijeso.rf.gd/bluetooth_receiver_software_for_pc_free.pdfIn PDF document text
    • http://mifevup.rf.gd/bandhgala_semi-_formal_suit.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/icml_2020_latex_template.pdfIn PDF document text
    • http://nigojelur.epizy.com/gomipigakasotofise.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_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 5840 bytes
SHA-256: a31c0f30804abc7477c94ac4a044465714eeb342fdf5957adfca1814dcbae935
font_01_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 11060 bytes
SHA-256: a21b6a3d16da5bd3d0bb9bd85abd6fc21305020714711565af38ffd04b61f2ba

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