Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e37046648164178…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 22:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8518c6a62b1e2d8e92b3fc2ac7c8ef01 SHA-1: 054a29750723e0ef000720497e368ccd073b2d72 SHA-256: 1e37046648164178f33429c0c9d556907b2566565019578a181a772b391627b3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates the presence of command execution tokens within the document text, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://inwebjor.ru/uplcv?utm_term=time+enna+boss+online+free PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/sifelawaxofenibami.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/bunabonukatukowozirop.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vuwirubawibaro.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109051853062242994ogs0ukmiwlj.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/duxisusofi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/28633330483.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/41122168779.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/tubusilokafixiret.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/73141347051.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/76147503532.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210910_110711.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/luxigotowetezubamoxa.pdfIn macro / runtime command snippet
    • https://topinsolventa.ro/userfiles/file/76744700140.pdfIn macro / runtime command snippet
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a20b2fa---rukopedemobotafura.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/41722392964.pdfIn PDF document text
    • http://yepuco.com/uploads/files/suwuwova.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86275521300.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/warudoxaligevadilup.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/vazivudadejikulezatumifir.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/16545429778.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tuminulijiwopupibuxutatu.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/bubovezijinivivafarofidax.pdfIn PDF document text
    • http://biogenetec.tw/imIn macro / runtime command snippet
    • 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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 17720 bytes
SHA-256: 2bc5ca4e37bb96c4c3d1ce599012b10c2584095aae64ef5f225c90992ae3c8d8
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10380 bytes
SHA-256: ca05deae795933121e6262b962ef6a1a1a456b4d95a653c0e52e3bf7a52998f8