Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a41d8f049fa5840…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 02:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30e467c71e67c5a0b08bb90c11614d76 SHA-1: ba65a217e1739dc8ecc2a1520d9409555f47761a SHA-256: 1a41d8f049fa5840c72dc75eb0ffb895485bc85035cec9d182bc8cd8b3cc6f9a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristically identified links to external resources, with several pointing to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting the user to a secondary PDF, likely to deliver a further payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://educaholistica.com/resources/img/imagesck/files/ronireverawafawoj.pdf In PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujekajijawat.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/5260677852.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/nejup.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/88947875961.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/zaxefesibevixobefavojofo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gulikitijomotujabuxi.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/57604399243.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/71213529574.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/xerati.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28453888897.pdfIn PDF document text
    • http://it-hair.com/userfiles/75151024025.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/31169704440.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140abcae4494---53730098387.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bedamoku.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/57922697084.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/45334500518.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31b5e91a8---beguzowipelesagogiwipu.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/83014124905.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/regunowisobo.pdfIn PDF document text
    • http://msiutilities.biz/documents/67349296154.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/26291161821.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rekifubuzobofavanekek.pdfIn PDF document text
    • http://synhbio.com/upload/files/3563537461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=10001+binary+to+englishPDF link annotation
    • https://lapdonline.org/file/14932439294.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 10716 bytes
SHA-256: 95d0a96da542506ac90e1322d0df9e3133aa242e369762eec78bec01a3448949
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 18032 bytes
SHA-256: ff0a3283c37f5d9b492386c051401f4555b8c53bdb49bcef55010b7c00a63ed9