Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19ea9d98b84f23b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 09:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c118853de4d311dfbd1ff6380c23c25 SHA-1: ec82196008b0bdebf1164fbb44238f3fe89beb0f SHA-256: b19ea9d98b84f23b8fdd321da39ee9f494f120f82b936b70696d6cda24c88b0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to external PDF documents hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of external links and the nature of the detection indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/piwotasoso.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ce1ed9e1---68724824679.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/86422832586.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tegafabifuboruputatawap.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/51818908035.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16149c7698684f---kupupaburulazolota.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/tavozaretakaj.pdfIn PDF document text
    • http://esen.life/userfiles/file/33107413806.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/dutelimarubifizuvon.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zofupomowiwekowotuvufedor.pdfIn PDF document text
    • http://askort.pl/Upload/file/kudevavaxigegoref.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/begobiw.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/fikogunikowise.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/66970977364.pdfIn PDF document text
    • http://rts-3.ru/upload/files/27482218168.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/lazewas.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/zotivixevol.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/fafexefepobawajunupexolej.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gopalugab.pdfIn PDF document text
    • https://finliz.lt/i/File/wusaxavupopinez.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/kotemomam.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lafazovizitaxiwavadix.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/telin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=monster+legends+private+server+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 10716 bytes
SHA-256: bcc5d07b93338132da5e9dc5fb1f1d9afb35aabb0d44da5a5769edb906e9bd8d
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 15100 bytes
SHA-256: 84377abc341ceea6b027b35493751974ffff912f9d1a256a12491a94305bd8b4