Malicious PDF — malware analysis report

Static analysis result for SHA-256 f548795af3670582…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 20:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa31fc392a42e71572f5ec16f2ab6bc7 SHA-1: e08c1e6f201be4edaec0b26320c6fb8b67a05743 SHA-256: f548795af3670582728ab32ef246c101c21af3572681cdd6056a3224aa29650c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'synerhu.ru' with a 'cooking fever gems hack' UTM term, suggesting a lure for potentially fraudulent content or malware. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=cooking+fever+gems+hack PDF link annotation
    • http://giftboxvietthuy.com/upload/ck/files/20764234749.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/jesiriwiz.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vijivudutibo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265cbd78dd---gasexanajebodemixekik.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/jejelefomixugisafoga.pdfIn PDF document text
    • http://signauction.net/userfiles/file/42342404265.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/83014124905.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/54635929887.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/96494712054.pdfIn PDF document text
    • http://splogservice.ru/content/files/kufumesodek.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72982221285.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wakifumiwox.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/29412246414.pdfIn PDF document text
    • http://15881588.com/ckupload/files/49660341582.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/piguwolamopaj.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valoxutodebidaweb.pdfIn PDF document text
    • http://gewald.ru/content/Files/wiwosiduvuj.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/73967091922.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/kolenapobaxivifagatot.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94993688272.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/73490046833.pdfIn PDF document text
    • https://seikai.jp/free_images/files/87727417202.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/49055961103.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/45880535082.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/23984463258.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_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 17080 bytes
SHA-256: 1bb31590649911039aaa87ca44aeb8fa13f4ebdfa2e02f667625864cfba2fbf5
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10828 bytes
SHA-256: 2227e2c3a521cbcfd01f947a7134c409861349e62d1fae9c952f51c07f5df149

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