Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef10a72669024958…

MALICIOUS

PDF

87.9 KB Created: 2021-09-10 09:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 960c13dd6c1ab1f00ce8d0848d7d2afc SHA-1: 2607231b8be36cdaa1012fba6e8f895e66ea2918 SHA-256: ef10a7266902495889d7cb8cea108dbfaf1e8e5853d41a972d41a18b8327c655
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://iphonerepairservice.nl/app/webroot/files/userfiles/files/nobobufadidamupibobami.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/risepe.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/linokelupagitisudinaza.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/nedogunawoneravodej.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/timobupizobawoso.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/30661445553.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/24365741073.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/32081045616.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/36036855043.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/fonoralejud.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/jebuw.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/damijav.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/70266540499.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/67514322621.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/93014195003.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/pasutufapuguxe.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lixuvizijudavurapone.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613171aa2d357---10863981947.pdfIn PDF document text
    • http://shamayachts.com/upload/file/45004781970.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/62861594882.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rivuwijunerevawijirij.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/40327086711.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac07b68131---dajivifoguleziman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sapiens+malayalam+pdf+freePDF 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 19592 bytes
SHA-256: b96670d58e4b2941e2c399ca927cfa03e59d93fead0a7482acf43c4a47346dfd
font_02_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 10628 bytes
SHA-256: 6573fcb814eae91aec300eac552121922b2af00db0cd72796c1ea17acc8001b6