Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3ea948a616911d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 06:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f0ee869516887877b22cd3f69d9cab7 SHA-1: 86cad01832ad42337c6920d05fba7675bed9aaeb SHA-256: 1b3ea948a616911df9b1ffb995304a7f874a6b26ec4fc52b3f2d4ec743bc2334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://turkuazhost.com/calisma2/files/uploads/79559738482.pdf In PDF document text
    • http://ficfart.org/userfiles/file/69227796405.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/likizozibakagigejozedujun.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/82609347279.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/sotisikaz.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/04/5584233971.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/75122542931.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dekatisaguf.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/92000356112.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/33722343457.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90066327726.pdfIn PDF document text
    • https://morabia.fi/images/file/90394337515.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6e85d8b---dukisuwilabexexuwevupoke.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rodiwivowakapor.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/tutinubugedawinalewarojo.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/25919377212.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/37170207902.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c63181609ec8efae8e1aa5ce41a02249/3759067771.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/bewewaluzefeboxuk.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/denafojiranoriwodilis.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/15870854537.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/44736053282.pdfIn PDF document text
    • http://ubest.ru/images/file/titubi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxasewe.pdfIn PDF document text
    • http://tfforming.ru/d/files/48718785634.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/kozozewuximonipokumokufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+fire+game+download+for+pc+ldplayerPDF 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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 17844 bytes
SHA-256: 32d801022523d56e87c98405fb36d686fd2060878c2fa2680fc29a1043387eb2
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10876 bytes
SHA-256: 65d64ab8db1e1a6ea29951680744e98b4567c82ea277c904485d4bddb7209828