Malicious PDF — malware analysis report

Static analysis result for SHA-256 786d35fa030a5015…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 00:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54c9a44436e2a1a1ce039d46926708fa SHA-1: 5551845fb5ae3cbb77f77780ab7b94aed4569560 SHA-256: 786d35fa030a501598cea9b08385bb60409f066acb65d9942d6e54d4bf590749
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=bulletproof+car+cheat+in+gta+san+andreas PDF link annotation
    • http://77owship.netsociality.com/upload/files/83738576500.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/ribupukul.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf82937bb---7190280322.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vupoginutimixuriva.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/98848243050.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/92263337923.pdfIn PDF document text
    • http://roocenter.ru/upload/file/pubekukabi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/48989172409.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/fivejutezod.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210918215901.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210912130616.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/10673739154.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/93333836848.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/52734143858.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9468a1d6---dodakeg.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/12707433577.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/38919433090.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xalovafebison.pdfIn PDF document text
    • http://mfahk.com/upload/files/nolomovuloruzim.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/25067624254.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/suxemizemusajininar.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/94147406876.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/68648589190.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/47707626833.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///70162388309.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 18072 bytes
SHA-256: b7f0cef3591eb6a247423222ec7bc19455dde82db3a30e78a7ffd19a6dedf080
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 11052 bytes
SHA-256: 3a00b3780f4f631608774e6c294102422fd5dd3afce7b61c8876203e43ddc518
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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