Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d7681c0f0ebc12…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 04:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5667d5940dacb9e374f27a4c4023d4a7 SHA-1: cdd30e57fceab0a0e66c1a7408bbf670aee8e3d2 SHA-256: 63d7681c0f0ebc129500ad9f8e76e179a2e10876993988da0f1142bbc11f31c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The presence of multiple unknown reputation URLs suggests a distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://textmakareknutsson.se/upload/image/42888691866.pdf In PDF document text
    • http://willbramephotography.com/98114902525.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kalexajejavexumasetenozej.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/woleduj.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/lutulajozovutajibanodax.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/89171316722.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/31183001453.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/98367156824.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wewexa.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/fufumasanena.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/lujomuvozopes.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wofuzeguzusepixerejof.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/2689773896.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/97257885246.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19033070487.pdfIn PDF document text
    • http://btfa.tw/upload/files/xevolapiwowusabirijegore.pdfIn PDF document text
    • http://chieucoingason.vn/files/29241487676.pdfIn PDF document text
    • https://dom-titan.rs/files/pepasojawemaloma.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nupesa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b09cc550909d8bfe3b3ef390873c96f8/60553075491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=internet+explorer+for+android+cell+phonePDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 10600 bytes
SHA-256: fff6f37ce5de206ee16c0eb1fd010dd01bae6adde3242aae3186ba182f7c3097
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 17608 bytes
SHA-256: babdfc93908605871203a25ae3392f3bf27462a40b1b07311cae5b33248429e3

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