Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adbbaf0751a3af2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 05:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9bf2fd1237bd98df75290dcc15ac2c47 SHA-1: b96049234acd62aaef524f900991e49af3d3ac6e SHA-256: 1adbbaf0751a3af297289bd24e391ba082ac93a18c175595f3e9497f384607fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and a URI pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=xiaomi+poco+f2+pro+unlock+bootloader PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cf57b4190eb15e93fd263de13c7328ce/xonolofim.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/futavitarogiwu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/40944204380.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/lagarowevuroxoretala.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/81916623885.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/88981981309.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ca9b2026---femeweporinikoru.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/82033407893.pdfIn PDF document text
    • https://mattress-leader.com/media/71086808183.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vutiz.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/jipubarazubidil.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/buwakomojituxowezivabomag.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/ritugazudukab.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/filizuno.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/46659440928.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/visaxosuxiletugolur.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fatetiwulubiwunaj.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/26118037297.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/voxisifalasipudiwazubu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16138472266e89---50190967307.pdfPDF link annotation
    • http://oroblupiscine.it/userfiles/files/49883904097.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/38810158874.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/fotinogixapuzuzin.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/25388298241.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/25540795072.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 11072 bytes
SHA-256: 51cb943995555388e65a7572c456502a6cc5bb0904c931286ec6e7b87e8f1e5f
font_02_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 18980 bytes
SHA-256: 13a8c0cb640e6f4b68b33f2f967b596d6cd9ad7aa1fa3550b3160c9d5c60cb14