Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e852c94bb5c949…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 01:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b55ed663b3d54fc8c3383db29953dfd0 SHA-1: 4f7589010a20f111d0cc9ab99b855bf376a98bd0 SHA-256: 55e852c94bb5c949621061d30979a18e2f1d68f6b4eda214ffe79d1b04aa1442
174 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'SE_LOLBIN_RUN_COMMAND' further supports the malicious nature by indicating the presence of command-line execution tokens within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dusunceokulu.net/resimler/files/muzarejekisuxag.pdf In PDF document text
    • http://stefani.cz/fck/file/41032759564.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/napisasilukotuda.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/5082256240.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/domarerujodalujezivezodit.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/moxozatajazuzedap.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86725737073.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/loniwa.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1564984726132f40b0b7fc.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/viruziveboxitelabefik.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee1e3fa4---xewurusibat.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/59824766343.pdfIn PDF document text
    • http://qdcmd.com/data/files/megakekiwajefosukam.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/85051533210.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/98553975544.pdfIn macro / runtime command snippet
    • https://leise.ru/admin/ckfinder/userfiles/files/86151377047.pdfIn PDF document text
    • http://gr-chem.com/upload/files/2480821323.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/rafof.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/18717406132.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/aqdai2e5lfhq106i5espia5ev2/60307571321.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109100006208723.pdfIn PDF document text
    • https://norservis.cz/files/files/79230034987.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/71910356475.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/63928133496.pdfIn PDF document text
    • http://chochosaneIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=awesome+tanks+2+level+editorPDF 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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17464 bytes
SHA-256: b4a8f8c6297cc88a64cc43a397116a7e49eab32a49590116ea930b3a50bcd9c8
font_02_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 10756 bytes
SHA-256: 4fa8eb76aeb045b716078cb48db31fbca833388f53b7b6e17ccb121a3c1471d1

Open this report in the interactive analyzer, or submit your own file for analysis.