Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9fe4c18fb4d30f…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 14:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c32c183396ad101412877a366bbd47e7 SHA-1: 92c5d79f04e6a3ba9c12ae9b95700a65d21ed055 SHA-256: 6d9fe4c18fb4d30ffef63c1b79724a9cd0c6d42fa79273ed15a012e20ef814ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm strategy, with numerous distinct hosts and UTM parameters suggesting a phishing or scam campaign. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://kodcomputers.ro/2664/uploads/ruwigavobefulumo.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/pupixanezaratumabi.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/488433883.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pivemuk.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/bodamud.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3a5243a8a76a0b2fa68ec9838695bc7c/mudarogilovib.pdfIn PDF document text
    • http://etre-belle.su/images/file/10938010627.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/denaxebijubavoxisagorevi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/repejikevebasiwuwunik.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/88345558533.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/witujofidedavadefag.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vuxidezaxalasepavofinuwav.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vipuri.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/32419943576.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/81655103894.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/kuvukojedozuvokela.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/97471792688.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210927_595915C1BDD17531.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/petavefujanixepuguru.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gixulogad.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/dagoxavolorovigegala.pdfIn PDF document text
    • http://czyxchem.com/upload/files/59413719032.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/fipuxefebejavuleze.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/rilawadoxamezitewagax.pdfIn PDF document text
    • http://talesma.com/E/file/sadojesib.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gifefisuritoretej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=differentiate+between+prokaryotes+and+eukaryotes+cellPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 11144 bytes
SHA-256: bced098c7c5ebc5279a7a6a92ef7df52f9c086fec0856bbf5219aef6f38431c6
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 16708 bytes
SHA-256: a7d40ed0d689805734010295df4d2c8f0a8387890c85c1b4953d11cb844bf253
font_02_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1