Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb8a7cac73a47b6…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 14:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc0f987ab8ec123f220058330867bec6 SHA-1: 40438c68901c7b030a918098a66103cf185ab008 SHA-256: 9bb8a7cac73a47b68e8dd78336bda1c01a734d0129ecc36a28df99156545dc2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting a tactic to distribute or obscure malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.siphonicflowmandiri.com/upload/files/vosizegevubulipa.pdf In PDF document text
    • http://raczcsalad.hu/files/degofewipuzakozilewij.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/44067162652.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/jiwefituzibazotesasa.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/6977933931.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/25474744578.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/volefijivajadanugi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/jigatu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210903_0C98A1AA1EC66AB3.pdfIn PDF document text
    • http://zaiger.ru/img/file/85469323659.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/wilej.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/93793709774.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/simivovetibunopisokajepab.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/purekorojupufozij.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/67810713347.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/jozagefisewurad.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/37543617986.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/30918111130.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/78849250420.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/21667939229.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wuligikixodonivop.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/xefejenomasojate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sonarqube+android+studioPDF 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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 14560 bytes
SHA-256: 2b027cff568cea25f9a9a828e436ddc301d29a41d8ae721f2aaf1748efff2296
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 10656 bytes
SHA-256: 2ffd42a5bc20f4e079586d2f35f76bab4450b35cbe5b520dfa00bf7026022a4c
font_02_sfnt_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1