Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03f86b49138535c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 10:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a5ceb583af4009b739509cc280c1d8a3 SHA-1: 8fc8e78b1ab14593a5059f6b6898031cc2223eac SHA-256: a03f86b49138535ca693bc7c7b0457360288926a92548df9b63574160fae9405
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://s4l.vn/storage/ckfinder/files/36811445335.pdf In PDF document text
    • https://fullgame.hu/uploads/files/viguve.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/14751884040.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210912085629.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jidejas.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/vojulazidigiporu.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210911_200440.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/41265518281.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/xijudibovumakujazogopidos.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/95356228537.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jugufofimexiderubon.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/nutenodelodexovagemiligi.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/79078567717.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/panuku.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3da452bede8d1e2786cb93f4aa7f4a9e/valavilexuvexokone.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/15971662449.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/dixeniboxolagevixipo.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/8312177677.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/13996931276.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/52950417028.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/38051454105.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/bozapuzakagoradafoluf.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/12680127118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+apps+are+on+android+autoPDF 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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10536 bytes
SHA-256: e3a8b13f3fdd2eda6851a9a95f6a00cdcb8f417d8740f7d700ba568c317d0002
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 17660 bytes
SHA-256: 61e7f019cc420bfcb311499c3dbf390b59f4450a4b8ef38a22a86d22a7af3aed

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