Malicious PDF — malware analysis report

Static analysis result for SHA-256 464a1ae89bba4c47…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d88c7adf7c6281e715557653a5f7f193 SHA-1: 995d973be6e8d46620b9ce1b2abc5d9e3d3bde91 SHA-256: 464a1ae89bba4c47d1085679472fda7a028310ce2bf568eb635e4e0dc3cc936f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://happyhanool.com/ckupload/files/81892835585.pdf In PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/9674399373.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910181659.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/wamuzulorolevixovimokaj.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/suvuxog.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090634427_678993261.pdfIn PDF document text
    • http://freetds.net/userfiles/file/25225167173.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163124810386.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109022120542991.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdfIn PDF document text
    • http://tianfonmm.com/d/files/lanekuvutogowi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///36357255520.pdfIn PDF document text
    • http://starma.pl/files/file/64318771662.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/66204161895.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e51906f2---lefaxujimamofovop.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/48769124020.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/nopeniwami.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dokuz.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/feketarabeximoromodir.pdfIn PDF document text
    • http://homeopathyhk.com/files/22817377642.pdfIn PDF document text
    • https://cargobull.cz/res/file/23337484992.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/28075201156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sister+location+free+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 18384 bytes
SHA-256: 1a32e556362e6f52209a1c8470e2adce535eadc32be8b129deba43b5b6b42d44
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10632 bytes
SHA-256: 23461778feac37de94f7a8396a3c7896a9b350f0c1700101ab23d49022ecda98
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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