Malicious PDF — malware analysis report

Static analysis result for SHA-256 05547b876a6a256c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34f95480da5fe100382e63915b03fcf7 SHA-1: 3e4bc41a03bfca0c017ac907050c8f7f8a63739e SHA-256: 05547b876a6a256c89bb717d4db5ea36d31d97806edfe40632c0e77635fa757f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://servicepapik.ro/files/38046608432.pdf In PDF document text
    • https://cauthinh.com/luutru/files/32761953138.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l6o5esigseupchse55oevmtosn/nuvukapomozafefuxexovufi.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/tuwepitalurufuwekiz.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/duvujamemevaxapat.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/78203814378.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/53527595789.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/77758114593.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/72827916050.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/lapesaj.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/zovodenudo.pdfIn PDF document text
    • http://zenithmetals.com/files/94737561089.pdfIn PDF document text
    • http://flomojapan.com/upload/files/51646285742.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/buruwenutonorefonaku.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130a31446cee---54691703816.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62066204392.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vobodomimutixanewa.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210902_680FC7E4FD2DDC53.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/puxojor.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/tiraloz.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/15359262376.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/48576296131.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/54642612473.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/gobebu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/69186552438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+best+editing+app+for+androidPDF 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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 15392 bytes
SHA-256: a09ae252b48fc2a652e4759367e90f9f1c531a81f84aa23a43a934c5e82a2be1
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10832 bytes
SHA-256: 2dc8b755ce40301023eb7484c6ade3d4bd151bdf47844f6622edaa15233bb1f3