Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0f59296e479ec…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 03:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7174d61a54436c241b930af6b247787f SHA-1: af82577cd63bb15c98beb7bf37ff02f85a431fa2 SHA-256: 4db0f59296e479ec6da18d42ab3aeafb6319c98bdc927ae8d2de875a68a3b505
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a disguised user guide, aligning with common phishing lures.

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://bologen.ru/123?utm_term=crs+user+guide+version+2.+0 PDF link annotation
    • https://cdn.sqhk.co/bitowiso/jeiihdr/contemporary_christian_music_worship_songs_free_sheet.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/kepimogafiwogaruf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff4ad5ca1586.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/lotafinisexizenositaxonup.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/hgcUUhi/malmo_ff_kalmar_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/8ucmheu/4056561055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd3b0e1e4a14.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/certificate_of_occupancy_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/Lhau5xZ/73220013586.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/libro_administracion_de_recursos_humanos_mondy.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/bivogegivukewemuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ffabfb219d7b.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/aN2ggie/nufawepufakifowir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377408/normal_5ff5504f88f69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/janodojivi/94065412137.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/jatixamikufetese.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/article_29_of_indian_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee1b6a7-e4b6-4fdb-a26a-060517a892e7/wacker_neuson_wp1550_parts_breakdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0110b307-398b-4d05-987a-1f840309506e/56850145356.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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 5020 bytes
SHA-256: a9fe2c593e81cca9644bb640a9a375d93c33c2a5d26b500b66b4608a6c0c072c
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 10608 bytes
SHA-256: 43a97c8ce1f6fca21e49620317c7f320bc4f49c3eba223a6e5dc9f9553338b75

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