Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bbd2faed10554f…

MALICIOUS

PDF

74.9 KB Created: 2021-10-09 09:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dca9ab7883cd38c45c3a2043dbd04d70 SHA-1: 50410fe0d038a51461ae8e5928922307a5f498e0 SHA-256: a4bbd2faed10554f8e04deffbeddd7137ba1344855a8396141e4e9e4c39391f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, one of which is a redirector with a 'state bank of india internet banking form pdf' UTM term, suggesting a phishing lure. The PDF also functions as a link farm, hosting multiple other PDF files, indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=state+bank+of+india+internet+banking+form+pdf PDF link annotation
    • http://telektrans.hu/editor_up/10236856877.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44224245407.pdfIn PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/59781066256.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/ladarapiw.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/kevajodimibopilirigagabu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/rerunibuzan.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/96071245069.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/380907737.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/25817052607.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/zuxapemosexebefixex.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/30319610402.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/68928994032.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/80813079028.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/65171374478.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/wozilirasito.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/60899684196.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/59353210075.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/zedinapogaz.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/lewijidigun.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jetataforofimidexafiwu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/rojaputilaparuv.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/32446911128.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/50237772973.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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10932 bytes
SHA-256: 520edea4f5a4cc662bab194d71c448f9787d9020c9ab9b54b90eb7401a6004f2
font_02_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 17256 bytes
SHA-256: dbe9e24f01bbc029ced13ce9393cc5f08e4531850b6349f483c0acff07d9574c

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