Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5340fdbd41f1751…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 02:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 417356acb02b599efd3e81f4680034bc SHA-1: ec23b10970b8ef3522a95d16ffd806ebdb539793 SHA-256: f5340fdbd41f17516904e8ac6c4a2a321394ee3dfea5f7ba190ced9de678f411
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed for malicious purposes.

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 https://infrive.ru/uplcv?utm_term=aging+and+the+life+course+pdf PDF link annotation
    • http://rickgrisolia.com/userfiles/files/zovuzavok.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/82967552513.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/55231508404.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/vipanit.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/25368798007.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109222210360417.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/33422089812.pdfIn PDF document text
    • https://hoongnau.com/upload/files/gorora.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42563768841.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/duvimifuxiwuxiji.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347b16448da---87636131774.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/93006238555.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/62894341373.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/99346890722.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/biruvu.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/muvazolapuxaxusakaxuna.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/19422690436.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/58821370096.pdfIn PDF document text
    • http://klemanpince.hu/files/file/40677727741.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/rometafirijo.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/logapufugapukerul.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/bajanaxegipavupipafesomew.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/dupafa.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/3412551449.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/54241535739.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_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 10980 bytes
SHA-256: 893153cd303150dcf9e5a66eb96e752c809d6c573be18b3360fa377c900cc8a8
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 15320 bytes
SHA-256: be7f5f9cffd1fea04b426228d526ff12ec355d521ab63c843f908b8f2b751fc4
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1