Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2423ba0c1fee25a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 13:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e289c5bc25e7fc8380f8cc6de160b5c SHA-1: a111595614f38066100f9af7a34c6aeb3a1fb500 SHA-256: f2423ba0c1fee25af0901aac46c5a8d23dd68db2731456b7b168f2dc3d7196b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dieterheich.de/images/uploads/file/dirotosapisovomumirumuzi.pdf In PDF document text
    • http://csc0731.com/userfiles/file/20210909055911_cyx5dk.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dujototupaginizofovigep.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/20779002233.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/86296584532.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/14307338113.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vatugivatekerumaxa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kexuzepu.pdfIn PDF document text
    • https://network-italia.it/file/wemusaviwiramad.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/93573053311.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/vojipale.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/gegebexakejekes.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86379838579.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/20759683975.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gigopatejitagi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ms0d4cfgtn0fdku2bav65h5mo/11926856247.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614177b8c0e78---62977155942.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/48799307000.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/38766750399.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/vaxixavud.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/pefanewefobuwelile.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rasapena.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/52545868108.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/19401819302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=state+of+survival+apk+mod+menuPDF 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_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 10992 bytes
SHA-256: 0c1be9d3d862357371bfd6efd802cd9e6a155ce64eb10041f8102951b1ed163a
font_01_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 17216 bytes
SHA-256: 5eebded495835ac85eb6718641a13edd06f925c62f37ba19b2e28cd60c0ee0f9
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1