Malicious PDF — malware analysis report

Static analysis result for SHA-256 169b467f70da4071…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88286c921439a1ac7fccd8af5a021da6 SHA-1: 3e26c33618c1ff459c2615a3d374f2808a3b69dd SHA-256: 169b467f70da40718a9f901419c96fd6671950dd9b0fa550f9c4c376e44e7a83
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though obfuscated, contains sequences that resemble command-line execution, further supporting the malicious verdict. The primary attack pattern involves luring users to download further malicious content via a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613516e92d8b5---ravusunanusa.pdf In PDF document text
    • http://yhbinternational.com/userfiles/file/65322091194.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/86994567246.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/nifeduneroxalijanoxeta.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/1594288080.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/3518196544.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909101407356629.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/59065446587.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/tirigukaju.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/26523874740.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/52318520293.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/53231728072.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/xajukazuvef.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/togixodisisa.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/melogifurure.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/laguforo.pdfIn PDF document text
    • http://qdcmd.com/data/files/75953009313.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/lavuditifibakapijofivuzos.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/xurodoxuguzowid.pdfIn macro / runtime command snippet
    • http://www.moyekolodin.com/files/61304365962.pdfIn macro / runtime command snippet
    • https://rheinfurth.de/userfiles/file/39223573451.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/bujar.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gowebiliwubikoze.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109080009121833.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/39624805164.pdfIn PDF document text
    • http://mrpokedb.com/uploaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=street+basketball+association+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 16284 bytes
SHA-256: 5287b0365d5c0618dc6c41db601a584919656aab3afc559b36d6ae3c17436cd5
font_01_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 19664 bytes
SHA-256: 185a5db326570b4393e7dec6872eef4bc8ceffa5071c8dea40bda036ac62b336
font_02_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10984 bytes
SHA-256: e28393e361e76036cd0104140f6defcc3fb3ba26b51ef11222d259d00029e985
font_03_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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