Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6d9da7581f1a0a…

MALICIOUS

PDF

83.7 KB Created: 2021-03-22 02:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3289aa581bb5fe9c9ccffb3e9d626141 SHA-1: 5980f43859c316d2dfbf1637126b93124ed44e6f SHA-256: 3b6d9da7581f1a0ac491fcc29ee47514e6a11653ea5bf9996f971dc77c06f59c
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-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://midufefew.ru/wix?keyword=family+guy+partial+terms+of+endearment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5fdebbdba98d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fdc1e62b71cf.pdfIn PDF document text
    • http://igcopyrightclient.com/kabigimonilinogarimixoxib91nrt.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/dMKgjii/85265005912.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/f0gj5m5/99013406470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5feff11049d1f.pdfIn PDF document text
    • http://copyright-securityx.com/57855273921a3j2w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_e820b514703b46d7ae526e3961095fae.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_2176a000bd03461f968d9e9c5f370211.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/konsep_kurikulum_pendidikan_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7849ab1-a799-4163-b78a-afd413637967/vexemixeniku.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/garujupev.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/xumelukonevat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f969843a-3f6c-4e7a-af01-222407862f86/el_mundo_de_sofia_sinopsis_libro.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_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 5420 bytes
SHA-256: 2fe9eb1cb6873e5b9f507cb44f40f41e50a796610055f86b644dca7f8d803e2d
font_01_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10952 bytes
SHA-256: 5b918941ce465e7bde61432139adceb7304df3354b560da774a82e489f2c1e36

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