Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cd1bfab6f5805d…

MALICIOUS

PDF

99.4 KB Created: 2021-03-18 22:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e040867f9d1a8283cf9c63456c60d764 SHA-1: e3cfdf8c59a7d068da2a3ac3b84b038a75fdab7d SHA-256: e9cd1bfab6f5805d966be8537bc64b2ec498fc3bc7c4d06981756b46064ebf19
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://druttle.ru/123?utm_term=coliformes+totais+fazem+mal+a+saude PDF link annotation
    • http://jumbochecker.com/20081486001xhso8.pdfIn PDF document text
    • http://reduslim-europa.site/22202970940ipy7n.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/413058.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/minister_for_social_services_anne_ruston.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_600cb7dc240e3.pdfIn PDF document text
    • http://doctorzlo.com/74590769820zhmza.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/9b9cbd0a5.pdfIn PDF document text
    • http://titanof-filtr.ru/240204106524o72y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5feb15e1b3cb1.pdfIn PDF document text
    • http://train-home.ru/14084911629p4eae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_5ff0b076c0b34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_6004302d6a462.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/3730066.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/69639841048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetafuxukijixex.rf.gd/tipijesosapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb23278-6d3b-4016-abef-da7ea1233b8d/bifonibojinikokutojuboj.pdfIn PDF document text
    • http://mixonanax.epizy.com/anaphylaxis_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64094aa2-e7a8-4ab0-9397-14e606a5f7ad/munemokoput.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_off000142af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 5008 bytes
SHA-256: 2b072c66744a3cf0ee2f8c074935b3fa2b985252e4b28d8ff3093670275e128e
font_01_sfnt_off000153a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A2 15020 bytes
SHA-256: d0e7b0c4fe4784f3fd84f49e50cb11e85005257f48d4a515027a4b963d338c86

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