Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d1092534ae7c53…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 05:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb83796261c83e32d7f6d87ac2789677 SHA-1: bb904657243a831ee968069188eb403de8f61f90 SHA-256: 48d1092534ae7c5377134ab4d817dcc82fac99cb528df3b52f646c156488da39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on different domains, indicating a link farm designed to host malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gbagencement.fr/uploads/file/mejawat.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/wuxowegebepepixex.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/dilopotela.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jejiwobopidowixol.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/15980141683.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katoti.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58023362429.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jogozux.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/89012018781.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210910083040106392t8s4s0.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/zidupafozefobeja.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zowabopokovatoz.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909051757.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mezebajodimenevuxitu.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/77531686340.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/17201638483.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45556313529.pdfIn PDF document text
    • http://asfalon.com/__files/file/46142871960.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/dixewajubati.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wapiv.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca83e5863---69264520540.pdfIn PDF document text
    • https://noventa.cz/media/files/file/22220435620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=emergency+call+se+lock+kaise+todePDF 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_off0000acd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD2 16040 bytes
SHA-256: c722fc29ed83b6b6331a381f59ec2a5b260243f155e9209539c0cac0470847dd
font_01_sfnt_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 10904 bytes
SHA-256: 9c7a3e6a6895db99dd3e11993cf6007ae9aabfd6a187870156c65fb1f96a3912
font_02_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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