Malicious PDF — malware analysis report

Static analysis result for SHA-256 785ac318a38940a9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 20:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da54d27ad02f1ac3cd96ba2b15cb2846 SHA-1: 57ec2f8e2532f6fa0ba825706879d402d4343a23 SHA-256: 785ac318a38940a9fa61ba668f96a4dc149c2e5be4642517f21b03a291148ec2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and a machine learning classifier, with heuristics indicating embedded JavaScript and a high density of external links, many on disposable domains. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=niazi+tv+hd PDF link annotation
    • http://lamgi.pl/ckfinder/userfiles/files/36610127516.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/15619287759.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/75327381306.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fikamanoxe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/fulevasivetonuwoxesube.pdfIn PDF document text
    • http://le383.com/uploads/files/munukanifadomugabixufa.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/giwimak.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gazela.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/mimukibazebuv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d50a3577e---50866260227.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eccbacaed9---nerewumewisuzinodalalubo.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fefalowegidalamemo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sirugawozeletujeretuzilo.pdfIn PDF document text
    • http://slsnn.ru/content/files/61844581607.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210923145003.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/xubafegijemit.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/77973102902.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/61616290845.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/dimegaxijadikiruzofaxovoz.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/93919443147.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/fakisikurigigubizijuma.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/96149823661.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pivarogoke.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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 9780 bytes
SHA-256: 13815a1dccf6be9551b981e5fc50f10ad06e0e484ecfe3a289527f4f12ff6835
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 17024 bytes
SHA-256: 548337ad7ec2be1c38e8c07780bde3a9d2e30d10b7377dc7e1109211dad0f40a
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1