Malicious PDF — malware analysis report

Static analysis result for SHA-256 e544990aa13f752b…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 15:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5a69350ede494f97d00bd9614cebbf01 SHA-1: 4b92c12c40a9fc21edbff5b62f6fa6b0efc1e359 SHA-256: e544990aa13f752b259bc4e567f873ca13ce0e2ae795b1107900bb21d9653845
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URIs and the PDF structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=watch+tamako+love+story PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161331d88b89c7---4358927288.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_232208.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/desama.pdfIn PDF document text
    • https://jagominum.com/contents/files/60397636197.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/edot1jq5cvj1uhps2sv3k8ttqg/kexumelixudidiveku.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1250180223.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lezoranibabadafotif.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/runopoxolajibe.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79146923931.pdfIn PDF document text
    • http://hanauhrova.cz/files/18330067084.pdfIn PDF document text
    • https://ibericadearmerias.com/file/tixofofa.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gejevepebamizigenesuj.pdfIn PDF document text
    • http://health-bridge.in/upload/file/54391562678.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sepamawaxanizipusuzexusu.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/dikevazojomiponafomaweg.pdfIn PDF document text
    • http://unseretochter.com/images/file/zobalevovuzepuwopegufa.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/19993945381.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/pifewukemedoludujajek.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210904_B8829D7A2A81FDFB.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/nuvuxelojedesawubajomif.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/buzejuzabixadidaxola.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109062050539350.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/9882001441.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/92996693281.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/retikanufofipi.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://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_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 15548 bytes
SHA-256: 836ef38207b8d7057502132fd8a49dfa9f4dbb80beff324ed3530aa4de362a9a
font_02_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10564 bytes
SHA-256: 67ae96042aad051b45fa4e6929063f21d8ecf40282057a6b86aadc6390b62caf