Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a9888310afa2f5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 10:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 541d6f126a43bd8677d3cc3b2f3d4acd SHA-1: a50aba65dc8b45fc2cf4882f7785e21ba6503a99 SHA-256: 01a9888310afa2f5c36ec726465302086d32437ee3c8c47684c308776d8319f3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external URLs, many of which are hosted on disposable domains, indicating a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous URIs suggest it's designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 4

  • 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://avigailpekelman.com/sites/default/files/file/moxizagoruj.pdf In PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xunedojokuliralosufifo.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/28606114552.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/10981183521.pdfIn PDF document text
    • http://le383.com/uploads/files/67176543703.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/65458588345.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nogewike.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb4337e52---revaroxiduzojinatezut.pdfIn PDF document text
    • http://ijfbn.com/editor_up/xukolakozinelagilovuv.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wanejikagukopiriluje.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/kujilesulebix.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/36302971154.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021951145411727.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/gifelilobovubuf.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/68907781852.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/nufegizimolavoxu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/xadojumaxetufodelu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/74911685394.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/nepobep.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/26071012396.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/25133097394.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/24436232678.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/puxekivozofadagamu.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/30744543124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=strategic+marketing+analysis+pdfPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 11124 bytes
SHA-256: 24ea4f44f7c46fcb354b53d45819dc78ab89c00f0a238086b960a7335472b3a4
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 16620 bytes
SHA-256: e4627e18537a63d11aa12370f0416be9245bef6714d861b387861d43d5244e4d