Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2c0db69fb787aa…

MALICIOUS

PDF

71.5 KB Created: 2021-10-06 12:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 974c97c4a28d798e1c0f67355c69c834 SHA-1: 8388d3ddcad95e682535358d9bfb75751997472c SHA-256: 5f2c0db69fb787aa7fe84f7f9e635e84136e0ba1ae9868ca5d51cb0355760c0c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful sites. The presence of 'cmd.com' in the document text hints at potential command execution, possibly to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://isdoor.ru/uploads/files/fazatagizelofebujadamof.pdf In PDF document text
    • http://titusauto.hu/kepek/file/28774975324.pdfIn PDF document text
    • https://foulardfotografando.it/file/xexofivufonadag.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613860823debd---kifovifukoge.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9ce02b92242700d65975746f6e15c140/xawabavikesapogomado.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/nebax.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/ruboledojuxinopozoriro.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/jiwoxiluvulagafakiki.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/kiliw.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/14205315532.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/besosijezupi.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • http://qdcmd.com/data/files/92124713250.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xetadomobifi.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109280644198156.pdfIn macro / runtime command snippet
    • http://intertribo.sk/files/2672179025.pdfIn macro / runtime command snippet
    • https://foodexgida.com/uploads/files/jixifoxekirox.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/wewuzebugebi.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/bijejisivatifujazebex.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/noguxazesalevesedanerur.pdfIn PDF document text
    • https://network-italia.com/file/31827329303.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/zisokoparaserugokatoz.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rowenumagagapozekow.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/88127590104.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67683717810.pdfIn PDF document text
    • http://emrc.ie/upload/imaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=intramuscular+injection+for+infantsPDF 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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 15364 bytes
SHA-256: 9ac3b515b16f4c6e71296fe6977a3b079d0be54b19a278e1108e2277a4e16220
font_02_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10676 bytes
SHA-256: 014ba093b527be6666b90eb258beddf8c41a8ef52c81ffb8a6d90ee05c6ffa9a