Malicious PDF — malware analysis report

Static analysis result for SHA-256 7249cdcc9328ee2f…

MALICIOUS

PDF

75.3 KB Created: 2021-02-26 01:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0656d0e6d5b7cd035c6c587b5ec645a4 SHA-1: 8a5d2d3fc527cf9495af036cec57dc6e5f17b76a SHA-256: 7249cdcc9328ee2f8b019bf4ff9ae719a5294b5961affe04f8f2622371521ea4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to redirect users to potentially malicious content.

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://seumenha.ru/wix?keyword=koti+womens+college+courses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059b65ee3cf.pdfIn PDF document text
    • http://pogofefopi.22web.org/mathematical_analysis_apostol.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/deep_sparse_rectifier_neural_networks.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/0a207a6565ce.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/010c4627.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/pikejozek-melalitasejazi-potibonet.pdfIn PDF document text
    • http://buylettersonline.com/61837747926e84qf.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/pegasigefadopezoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_600cdf99893cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_600fd48cdb792.pdfIn PDF document text
    • http://itnegozio.info/what_ink_for_canon_mp250igujn.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/warubigazemej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_602f9d102657f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 4968 bytes
SHA-256: 3bb7fa8b9c7adc4bfbe50b86b98abd849253055c9414485de82c2491538539c3
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10424 bytes
SHA-256: fbe9ac794937a82c14fb72c4513799004b2b1896ecb64171a8f626231a1aa4fc

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