Malicious PDF — malware analysis report

Static analysis result for SHA-256 74804dc742efd80b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 17:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 269d33d73da34dedb2350cb79acb2a19 SHA-1: 5fce2df67d42c867691cd2fb5fee756296faa693 SHA-256: 74804dc742efd80beebfd8cb8ac960650fe9d639bf678572a5eef2206a1c3b6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate that the PDF's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=medical+histology+by+laiq+hussain+6th+edition+pdf+free+download PDF link annotation
    • https://radio-aurea.eu/files/file/mojixamuzokef.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63914316922.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/19489239237.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/62748454671.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/56904312106.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/nokixetalulowo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/db3b562b7e66020677ed99762c38bc37/pililizukulenamofipe.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/jekasizinij.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/53133581970.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sevoderubofimowupevedajuf.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109061818272323.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/57279754905.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/novamigemipisuze.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/28612230844.pdfIn PDF document text
    • http://domosplast.hu/files/file/56317901518.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/lejalesabilawufupi.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/bijowarumok.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/43878302577.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/kunabupumotire.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/82759013067.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/47806601891.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/85031728323.pdfIn PDF document text
    • http://warungmimpishio.com/contents/files/melexe.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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 18968 bytes
SHA-256: bb6f0be39c78e312259232ab3d6cd5a507396bc14b4a615dea75314ba319dd6b
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 11648 bytes
SHA-256: 7e091bf2cc2a918cb1dc7ce65a2163de452ef9a90a432b45f235c96de0732398

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