Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9a2bd21cdad274…

MALICIOUS

PDF

92.3 KB Created: 2021-09-12 21:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d3d6e8eff12508d1f2a9c0b4edc9fe6d SHA-1: 4350994bbfb3130e2e5b6584c715a85eb75b3dd2 SHA-256: 5c9a2bd21cdad274fc2292bc5586ae9b415145720bb601c44703e0d275730b2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=react+native+ios+clear+cache PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/56564895770.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/12754632622.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/51935519719.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12641877121.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/barowalixomewoxepororinu.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68648182786.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/58379048549.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/79356677034.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/76926120325.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210907164424.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/41519983467.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/goxedunajinepala.pdfIn PDF document text
    • http://th-hl.com///upload/files/89422524529.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138088eea3c5---84120627892.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909075009968886.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/ludepevogasoluzutalar.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/mabovabozenesijivada.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91611265687.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/33327324773.pdfIn PDF document text
    • http://www.buildonhope.org/file/kedabegiruragevurifelelo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab3ff220e---kakenafogekamaxu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/55012395046.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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10436 bytes
SHA-256: 61ed06e69743a74a8d6e905da9e0227f6c5cff52f442397cedab154156d7f3fd
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 23264 bytes
SHA-256: a4ff5a68f7a67b6b2da34e8a5f251d88de83d62ea19533e020cf45112197e9bf
font_02_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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