Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10978e3151f73f2…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 15:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a92b2899061f1b1c063647f38e5b798 SHA-1: d8b1f5ca2500841b9dd0a9674b8e06850c308e95 SHA-256: b10978e3151f73f27152d71e1d0d06f61315557a07dc89298f031c0f4ae3585c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=gloud+games+mod+apk+free+svip PDF link annotation
    • http://ekopaczka.pl/imgbrama/files/749029844.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/28102155784.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zagowogugapibakefej.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/vobuwesafezitutazizosubu.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/dugedogof.pdfIn PDF document text
    • http://citranco.com/users/files/revojuxuvovujajilo.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xatojopoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c7be6e6---tufigakebubisezenafub.pdfIn PDF document text
    • http://citty.org/images/uploads/file/juvedasajaja.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kizepi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/vuvarezekavetafiwur.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobewakumidinut.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lavujetilatenifuwedu.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/54794834327.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/33935443357.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/29735838615.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161527defb6b45---46216238917.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/45989036196.pdfIn PDF document text
    • http://ativn.com/upload/file/bifitaboxumojodorebeki.pdfIn PDF document text
    • https://media-get.com/userfiles/files/maxaluj.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/luwewoziwofokikomulidifi.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/27242191311.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_off0000aead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAD 16884 bytes
SHA-256: 45d1f8f1e56075d751e706acadad5634a50b0ece97324a29dd7d60d52e1230a2
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10936 bytes
SHA-256: e8d44045bf5a5fec7b89a32783e45321c28a1258133f627e051246f1f82734c0
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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