Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aac53b6cfb10387…

MALICIOUS

PDF

96.3 KB Created: 2021-10-07 17:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ceee8c704ef61284dfa54493834707dc SHA-1: ad725d6ac4a585cc81050d0d5dc01582a8076f8c SHA-256: 3aac53b6cfb103870f7f01b327ee248478725c06d01b2936a02777b6a8ad0761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=geographical+center+of+europe PDF link annotation
    • http://sochisushi.nl/survey/userfiles/files/lurosala.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/kutenoxegobe.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/telon.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210917_F64E31F79131B4AF.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/48850994453.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pobuxolef.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/vuzif.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/17466507234.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/38770801260.pdfIn PDF document text
    • https://servicepapik.ro/files/89490735915.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/60395486785.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/69421125805.pdfIn PDF document text
    • http://melabo.com/upload/files/vajaguneposofegozami.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/65196480252.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/sowulibebosumusotebagek.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/12803992799.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/minej.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/74617713702.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/lakunededebojexedibegi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/35630146841.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/susuvafodatoxile.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/juvakifofibolilodajo.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/fifusobuzugevet.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39740375278.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_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10728 bytes
SHA-256: 59a8dcfc4f625062f66a544aecc7fbeea8cf9adde07db0f03c234b580376166e
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 23080 bytes
SHA-256: b2bd87bd06f69bf92819f8ff9a72fc8697baa50050b49b6155414ec58e11c78f

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