Malicious PDF — malware analysis report

Static analysis result for SHA-256 696c59dd7269549f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 02:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 993fadf636f9c665464c973f32ee9a0a SHA-1: b0e86ee303ef565349684f60dbe4517f2aea56e5 SHA-256: 696c59dd7269549f675f59c81fa61d036e364c9dfddef70733ff33393db4877e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=bus+simulator+vietnam+apk+obb+download PDF link annotation
    • http://mislenyiallatorvos.hu/userfiles/file/xusisawonexugo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c2d47224---85465500931.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/90871391283.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mpm2eer42ofavfh3ig7ootmon5/38349141603.pdfIn PDF document text
    • http://ccshecea.org/upload/files/jemixuxonikunovisalonefo.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/36186893110.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/wagiwixefiwofanesivobaru.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/82472041677.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/guvoxupunefovapet.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58880760070.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/13589739407.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pibak.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/muwovodisal.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/rufegivujipokegokoj.pdfIn PDF document text
    • https://profm.hu/files/file/70955010664.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/vuvutulidiwigojegete.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/jesifosigapubepu.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/vavedawumasobumefe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vakojiza.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/75709812050.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ridukilobazilejen.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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 17212 bytes
SHA-256: 1f2dc1b0e177e9cd7e9fa7b3d8b6a71df1d92e27c8c9c511139dfdf8710b2d9a
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 11092 bytes
SHA-256: aeef9a006e5c49ba7b4da7adf280822766350ebf7bd8c939a189f672fe4f7137
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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