Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb1b4dbdc2ddbec…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 00:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfb36096a2751a4aabe8eef4b3a32323 SHA-1: ea62b7c3a274276df0b3a80f1b677d1875aef146 SHA-256: 9fb1b4dbdc2ddbec6ea580d9adb56fc5515fa332b2ccfcce5758a08577929336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://penzionradvanice.cz/res/file/bomakapavokedatagajidot.pdf In PDF document text
    • http://altus.pl/userfiles/file/34292465145.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210909050415.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sexebosevagenujeto.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210906063135.pdfIn PDF document text
    • https://aildf.in/userfiles/file/8262117228.pdfIn PDF document text
    • http://portableandcool.com/files/files/jipirimixo.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/lupofewikomivogexuga.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/31991291548.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cd5ae50b---desumafaxodebulej.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/45949190585.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/55701501618.pdfIn PDF document text
    • http://word.mn/uploads/assets/89904412993.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ruxomela.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/daperumivipevuwal.pdfIn PDF document text
    • https://festacontinua.it/public/file/18382346435.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/timupotiwexi.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/48078832462.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7a266c50---56827086169.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/15815523125.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31921552943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tv+channels+for+android+tvPDF link annotation
    • 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_off0000bd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 10600 bytes
SHA-256: 661f7d693b6c71928cfd59d4878e7057d2ef2ba46901109214e7b7b2ca899a0b
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16304 bytes
SHA-256: f4fed6747b65e4d127407d7c3fff168cf6c5a6e90fec85a5f6a8ef8f96abed2f

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