Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b375062a5cc921…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 22:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b811d074deeaa299824378d99071e0c SHA-1: 6ffbbcf3498c721a2b0d99e281a940f741572cde SHA-256: 14b375062a5cc921c996d6195bf99b747cdef693c883686b954dfaa5d7d71a21
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of a malicious document, likely leveraging exploits or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mousike.it/img_ins/files/purulujaxogaror.pdf In PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/17874013594.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/56742070821.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136980dea74f---78630885846.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tofuj.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/bofotisifelixu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/tonefalupoputogisubig.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/32650516287.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/78825471712.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/56844379653.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/88150633821.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sefegug.pdfIn PDF document text
    • https://rafautama.com/uploads/file/16800517.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/2246808905.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8kbrelqvnpf5strmkihnpgn08t/21068876786.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/43357855768.pdfIn PDF document text
    • http://stylekd.ru/files/wixexof.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16905026515.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kebexodijed.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kekalofigodejiwufexexiw.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gatibobijatu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/127080963.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/pidenuvubowawikanigironi.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/wagoronosexuwepotukuwumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=roman+words+that+start+with+yPDF 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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 10580 bytes
SHA-256: 46ebe7b5408c8b391c6a9688ff12bd7538d6fac1ead247ca741e93f30aa0595b
font_01_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16704 bytes
SHA-256: c29a660cb2deea640ebfdcd266717b043536edc0dafaf933a00923cddcac35e8
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1