Malicious PDF — malware analysis report

Static analysis result for SHA-256 61521ca987fc3182…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 07:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6df51420881d83b5eec007e9a45541b SHA-1: 363d20456f65f707da1ff051f97c07030b1c9ee0 SHA-256: 61521ca987fc31829b6b14fb7353b7a0399b5c2d1162126c3dcabe599e541226
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=up+movie+fmovies PDF link annotation
    • http://luluscafeonline.com/uploads/files/57689307513.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210910182631.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/45533263212.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/38385097958.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/porimutitar.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/zikobaremavizaguwevutasi.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/8079894529.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/86659104011.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/sivupimedarit.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384250697be---36564305594.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/45751370875.pdfIn PDF document text
    • http://parateam.cz/file/wafaduxora.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nisesexuvejejofebonejo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fadoluzalexu.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/dedisetodir.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/75540020172.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210909024750773.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ug1cdotgogh33td27cmd2hifp4/38169261846.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/17148429961.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/sarab.pdfIn macro / runtime command snippet
    • http://vkts.se/userfiles/file/busavedixunozefa.pdfIn macro / runtime command snippet
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/72063793223.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotelajifuvorojo.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/tanabepol.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admIn 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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10080 bytes
SHA-256: b9e936c1f36836e4b63956eda54401c94b97ccaf2fa1e79804ce8c0fba661c10
font_01_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 17228 bytes
SHA-256: f2f1203dea8f2f4a10ebff7f8f0a1435f35d6094c035f1ce8b1ba4e6b3088258