Malicious PDF — malware analysis report

Static analysis result for SHA-256 460f5505212cd51d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 19:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 76533fecfe1149b0af00cbf1d6ab15d3 SHA-1: 091b55558059c4c985cd065bbd083c9b10483e3f SHA-256: 460f5505212cd51de67803882b4cdb1e3b1a705364f449920a16542871815c7f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm structure with numerous links to potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of many unknown URLs further supports this, as they likely serve as lures or landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://usssecuritate.ro/userfiles/file/3979344623.pdf In PDF document text
    • https://chineseclothingonline.com/File/lupelurin.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090205295677468.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/93716951948.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911182337106697.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/xajivufa.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/61565533558.pdfIn PDF document text
    • https://jensbrode.de/files/file/5877887098.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/83866766366.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901121746_453139782.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/zimifatitavow.pdfIn PDF document text
    • https://eklyps.net/images/file/15696857824.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/64962764520.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jevib.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/71604029235.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/wokivedobuzidupuzoz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/13541372145.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nofevegasilasa.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/91939358267.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85696686100.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lapofemi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/63318128963.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/87059736503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=easy+bar+chords+guitarPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 19132 bytes
SHA-256: 7464d0c73737a4da2d0e1094e357867e2ca285971d74134559d36716f1106c01
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 10704 bytes
SHA-256: 88a92bf8bddcb8a8163ad8ec2772621b683f9996c3bda8237147cc2ecbd10938

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