Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f6e4d0d7360fc5…

MALICIOUS

PDF

98.5 KB Created: 2021-09-19 22:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3a6190013393b5b2d425eff73116404d SHA-1: 67c60e74ba0f8c76d3f23f068cc1d6a04ee719c1 SHA-256: f6f6e4d0d7360fc5557a7064c6a1e7546528bbab7564b8fe80f94d663290b937
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1140 Deobfuscate or Obfuscate Malicious Code T1059.007 JavaScript

This PDF document was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake CAPTCHA or human verification prompt to deceive the user. Numerous external URLs are embedded, suggesting a link farm or redirection to malicious sites for payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://cructi.ru/uplcv?utm_term=free+gems+in+dragon+city+no+human+verification PDF link annotation
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/lofesoxiwepebodafofewisiv.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xudajejamoxifinixijuna.pdfIn PDF document text
    • http://tzsunup.com/upload/galidikivenala.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad3d2f34a---budazitibiguzetaf.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613699eab5ca4---43930619924.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/furotigogi.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/32390583849.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/silogiwupik.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/lotufu.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/xezopawukexawisateli.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210919_101016_1687.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68078636293.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/karudizofexaripuwebe.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-09-56-36-51.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/lepap.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zisipuvajetabupilovoj.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/jafofidelozo.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/vonozosapuvikinanatuzix.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/fuzumenunuguvafetojipi.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///30205429425.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/buxami.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/99525408270.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/76908453154.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sunudiwazenonodazugo.pdfIn PDF document text
    • 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_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 20372 bytes
SHA-256: 0281c21d9aa1041ab4fb204e4a7e857c01012180a683dda4c20482a7ee393f32
font_01_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 11136 bytes
SHA-256: 2621350562b33775f570982af4d0d506aec0ed0942586aa5f8090298034014c0
font_02_sfnt_off0001641e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1