Malicious PDF — malware analysis report

Static analysis result for SHA-256 9942f97c8f35e582…

MALICIOUS

PDF

104.6 KB Created: 2021-09-23 07:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbadb6f128a966a55a9ba9af293aeed2 SHA-1: 105eabeb211de937e03b849d3713f2776227fedf SHA-256: 9942f97c8f35e582f47c5388868607f37fb01efd2fb384f26ab61ef3b1587fdb
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple links pointing to PDF files on various domains. The presence of 'LOLBin token sequence in document text' suggests attempts to disguise malicious commands or URLs. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hoihj7psn9je6iuv603aprtdbg/78626206746.pdf In PDF document text
    • http://charmingcurls.se/upload/file/zenigolimamosajuwugojasun.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fobirafa.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bipuzejewakedij.pdfIn macro / runtime command snippet
    • https://xo-sound.ru/userfiles/file/53759881418.pdfIn macro / runtime command snippet
    • https://k31szmq42-nu28.com/contents/files/87447936241.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/13981806398.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/79529918584.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a14785b269---6597995429.pdfIn PDF document text
    • https://ismart99.net/upload/files/taxuxeralidadimusigalem.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/zumokite.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/23272805248.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/jijijavegexu.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/63672658750.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/84973663405.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/mipumetiketebosuvaj.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/50940633329.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wodobopakowajefesev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+64+bit+assembly+programming+for+linux+and+os+x+pdfPDF 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_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 11616 bytes
SHA-256: 046b839b486fb4e4567034fae4762c5a1f23c3a9077264efe7ac2f620298531a
font_01_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16113 19672 bytes
SHA-256: 39b26e1ad3fbf66548f4affceb07d6d99c8897c67223a3c7ebee8ef43279645e