Malicious PDF — malware analysis report

Static analysis result for SHA-256 1811c2707246a10a…

MALICIOUS

PDF

74.7 KB Created: 2021-10-01 21:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 984034d9e1c86d8f3da888cbb4a00f18 SHA-1: 9578078b11f778c2743c1339989c41163067870e SHA-256: 1811c2707246a10ada093d2bdfe8f1fdddcf02ce2b45a22a644dce6a62a04850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://uptownchantilly.com/uploads/files/30620375296.pdf In PDF document text
    • http://babyshelter.net/assets/upload/files/lagowefiwupax.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/12573748938.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/93875037173.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/zadurujudobega.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/48006137222.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jife0j2o5k7mj9h2fsmhtuj6k8/89420143794.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/mapigazumag.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/81980466774.pdfIn PDF document text
    • https://tmtteks.com/files/fuxugomisi.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29624805156.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/23061380237.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/3765475674.pdfIn PDF document text
    • https://mahae.hu/files/files/venugawejajeruxerolima.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/zoxojopalokigobasewum.pdfIn PDF document text
    • http://serting.eu/userfiles/files/34742609823.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/sudoluruxewakiw.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jebuv.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/zilabezew.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/952c63b4d9e4d4a4a51217f557fe203d/sapitonovonovidumaluxataj.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/temujoxalajidufipawalun.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/mevuvemipemerosakirimo.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/bikajeduzifox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gerenciar+dispositivos+android+googlePDF 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_off0000bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 10792 bytes
SHA-256: 29ea8417071e2f6e54946ce03af879da7017bf7677c703e28c34496a68f9e3a6
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17848 bytes
SHA-256: 5baa22ca655bf5e4e6aba7c1ce3b559f12fd5f4674d4a9cfd175628719ec9dfd