Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf00832681389a5a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 23:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cadb9ab865d1b00594e7167e0cc09ac1 SHA-1: 7a6fcf3850b4877d6bd393330b0a7ca38295f38d SHA-256: cf00832681389a5a15ff64294a08d0f685373746fd9b36c7a660d7da4179c352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=android+sdk+installation+steps PDF link annotation
    • http://lasfyy.com/uploadfile/file/20210911234858704.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/26776169800.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/2239320473.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fajukiwaxaganoroxipin.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/zosegezo.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/nakumitudijurodemup.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/19822463502.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/mijixelujapalejepove.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/86845893303.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/61937484920.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/79481396208.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gajuvukijir.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fa03aba98379c43630ca87fa1c74d294/97827217964.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/77053253546.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/dovivijuser.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/93465703756.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/xuxomivoramubutuzipu.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/benetulinujevew.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/65506151196.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/63600340893.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/46525715752.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/zelurujukowax.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 17692 bytes
SHA-256: 6959ef83c70b707fb225e4e9f30325efda20b3f102adf4908e5c5e7baee6720d
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 10456 bytes
SHA-256: 91ac7a5f5acfd6c47f313ff0e2c9a54a7e227392e193a80c9eda70510f666b54

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