Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d44d99e5a37ee6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b81f813b285397fc7126daba0a78d505 SHA-1: 0b3a99e6073d9de531ff49289ab4d3c5346f21e0 SHA-256: 01d44d99e5a37ee64dabcce70e57feac528c0c43d24780723f6edf5accc5b53e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, many pointing to disposable domains, and a heuristic identified it as a link farm. The presence of 'cmd.com' in the document text suggests an attempt to execute commands, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://urjabatteries.in/userfiles/file/39869312047.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b51e45d173ffbe4abf4b5857ffb20000/notidefusamejulokopur.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vuleraxowanijegubiluta.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/65916771471.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/bizimasumozozanojedu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53396803875.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f7735ce488c881c569bf80941d8665e6/37562435603.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jamemazowapavavazo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/sowivizigadezexeg.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/21901763199.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/8033519217.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/77643921116.pdfIn PDF document text
    • http://afslab.asia/upload/files/nibetivinagav.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/822010619.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/sizimezuniju.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/pekifon.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/lesifigifopuperaxozunixaz.pdfIn PDF document text
    • http://qdcmd.com/data/files/36148658826.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/fevax.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/300051079.pdfIn macro / runtime command snippet
    • http://www.enfersalus.com/ckfinder/userfiles/files/jigojitifujiguzitokilube.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/21316599441.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/34287780642.pdfIn PDF document text
    • http://hainescentreasia.cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alpha+drift+car+racing+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_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 10840 bytes
SHA-256: 9caf975f65748af6a22cd469dedbaf66eb7a48f7273c112bb95e422e079f290a
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 16508 bytes
SHA-256: 306f49ab0a2f75cc619690973ee919c29bc4ffb32a47f40551eca91957342d9a