Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4a4e81de0679cc…

MALICIOUS

PDF

68.7 KB Created: 2021-10-07 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eaa1cc2bf63415ae39c1b309fc40a5d1 SHA-1: b8968a079533653627b4a3d80be9e477b9d02e47 SHA-256: ee4a4e81de0679cc3656c4e2edfb8b98ccd1070347f720972c0e9d6c20d2190d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that has been flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing further indicates the presence of suspicious command sequences within the document text, likely related to executing or downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://flyingfish-stay.com/userfiles/file/libekomobeluxagomiriwosom.pdf In PDF document text
    • http://charmingcurls.se/upload/file/vuzivez.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092606123399.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/39371745050.pdfIn macro / runtime command snippet
    • http://alacarte-grafik.de/userfiles/file/milejurov.pdfIn macro / runtime command snippet
    • http://baovekhucongnghiep.com/upload/files/15103742790.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3ae7a4d22cd6080e963c1a5b27910ace/femeziwe.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fowedapagumidurixotowoza.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/gitavowogogenebobugomijow.pdfIn PDF document text
    • http://soles2walk.com/data/file/lofurikekefetikujekexupak.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/vomav.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0294550ec913283c518a2f1a58c21a22/mubugugonemewuvob.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/rosup.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/sewesav.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/85535662220.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///8119750305.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/solilewilisirelodobozux.pdfIn PDF document text
    • https://buyafranchise.org/files/files/99126392176.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/fojavutufopemikuxusagaz.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/giwimozoze.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/sederunixaji.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xofemasixarebuxelup.pdfIn PDF document text
    • http://lltsg.com/uploadfileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+cthulhu+keeper+rulebook+7th+edition+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_off0000ad9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 15064 bytes
SHA-256: 12354cf5c33e392599497021525875cf0d181221c52bf113769d13264510733c
font_02_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10964 bytes
SHA-256: 0fc587c77cd721c229aa2edd7556217add3cbb1acfe082e6173bca76bd11017b