Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dc1f9da62f499f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 08:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b8e04b06e73f33ef818397035281939 SHA-1: f84c451c2d6edd3a75e80aeea081ae2cde950fbc SHA-256: 92dc1f9da62f499f473782da6baceaa78c3eb06aa936c0a1152983e61f2a0335
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous links to disposable domains, many disguised as PDF files, suggests a link farm designed to trick users into downloading malware. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614161d72e948---9529373478.pdf In PDF document text
    • http://quaretti.it/userfiles/files/4187616306.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/viwixilufegojow.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/motumikuz.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/93139631821.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/9847045836.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/12097622022.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lipamelifogewolesil.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/demivomupolenafiketuwup.pdfIn PDF document text
    • http://air-con.ru/upload/files/66021505856.pdfIn PDF document text
    • http://storemisr.com/uploads/files/nekadetetalufajuk.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/11783714895.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/1494522963.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/73518092315.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/4685089872.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fuxusuxopum.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614919d231bbc---99029713719.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/rulejipozisunu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/91119303830.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/15285879557.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/15322940332.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/14840841152.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fiwuzorekor.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/45389181230.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13163374798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=violin+magical+bow+mod+apkPDF 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10648 bytes
SHA-256: c5be3b567d70d521e32f1762d2d2239d3e67d55f9e9ee1b3dd6b70ce585b9df4
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 18068 bytes
SHA-256: 4291d4c4781749c29a09d992c15a4943b431c2fb3eb3d60077164c3cea5de2ad
font_02_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1