Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d13576211043f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2b66798850041813cc1f5b4697d2102 SHA-1: 568e6cbebfc41fdc1826fab00501a5d30e56c5f3 SHA-256: c18d13576211043fd6ea6f6f3b03331ecd1e047a9eec42041a6a84d4b728cfc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious. It contains numerous embedded URLs, including one that appears to be a phishing lure for Instagram passwords. The PDF structure suggests it functions as a link farm, directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=instagra+password+hack+online PDF link annotation
    • http://zdrowejaja.com/Upload/file/jagafuxadoza.pdfIn PDF document text
    • http://elpijisystem.com/file/xilalotebula.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xelexadeluvekomawimovase.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88429319074.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/66049023846.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/28042018396.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/samejuki.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gejupisabarik.pdfIn PDF document text
    • http://come2menorca.com/images/file/44739900103.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/muzagetegaberapesej.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/degekigofuzuxodumis.pdfIn PDF document text
    • http://speckrepej.com/upload/file/loxarawog.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/vedojavefobox.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161318607a9889---72045225048.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/difovefodavuvoruj.pdfIn PDF document text
    • http://cutskytools.com/d/files/821789400.pdfIn PDF document text
    • http://canvangdientu.com/images/file/85695303881.pdfIn PDF document text
    • https://2winit.com/Files/files/39585959126.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/rilafez.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/82160619112.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/xivabineguvimume.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/gijiruniwipel.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_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 10920 bytes
SHA-256: 3a627555aa071fc6d9faa87ed8b91b85606bf6d68e82f814204f7d9c0c4356a5
font_01_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 18340 bytes
SHA-256: 5c8c8215029655c44de264b91fa5fa25e11d02a05135842ba185cd9b199891ac

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