Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fffb7acd40fc7a8…

MALICIOUS

PDF

95.1 KB Created: 2021-09-20 18:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d47f79621fbf760e99e9bd4a591f3bf3 SHA-1: c58820e8435d2138e58eea7472393514f904fb56 SHA-256: 7fffb7acd40fc7a8a9099f555797b4718c6370f13c85a21b0c80362ff48c106c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=rta+audio+analyzer+android PDF link annotation
    • http://www.siposferenc.hu/html/35372038223.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904230750851.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/bilubak.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/73518787835.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/1883051100.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/tojajowozijasugofezo.pdfIn PDF document text
    • http://ausafe.net/images/art/files/nefotinifal.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/gowudoju.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/77494923472.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/xususoxisezujafebokosap.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/keporedosinozetazezikego.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/45285650609.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/sororeravulezasaxivop.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/41514135396.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/38424191072.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/wowujuwowene.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/lozalujukewerujoso.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/72257494026.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lotobigig.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_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 10392 bytes
SHA-256: a20de698caf74b0dad5381b5eccf6f5fd20751b841eeca99caabc26f13889cfa
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 19684 bytes
SHA-256: 5b3abea4c0beb26920778e0917c62a68efdb392426bac66c64f9da8ce905bb3d

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