Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53f3cfee4f2044…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 19:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6be8fc5660df40b0ad05acf2406cea3 SHA-1: f3e1348c5c1e597cfd10c4292d41e48e5c775764 SHA-256: 2c53f3cfee4f2044327892751fb6633763eac764c6a9c54f1c01de13dfce4933
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs were extracted, suggesting an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://szpk.hu/_user/file/97605870776.pdf In PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45032414358.pdfIn PDF document text
    • http://naso10.com/userData/board/file/10772171444.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/61580011615.pdfIn PDF document text
    • https://taperagi.com/contents/files/forapokamitidipup.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/lujexasurakoneduwivavo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613311d3a00d3---24374986401.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jopukufusovosipex.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gugerimumepenutopo.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/julowupikurenorijad.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/wokanog.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/17262338314.pdfIn PDF document text
    • http://client.diffuse.info/files/dusexunalatamideripajexa.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/banoruxu.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/82602968185.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/voxidapezog.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/vefexaja.pdfIn PDF document text
    • http://boki.hu/editor_up/kexupuluwesu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/3892118488.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/febuwukenejejoragi.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/padotiri.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78495156586.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fevukotizuvotijegusuful.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5f5e8915---negezewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bangla+boss+full+moviePDF 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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 17912 bytes
SHA-256: 82e91e3dcad9ddeb9a19186bebd9d6bd3c909580f50ec0509a8e49b2123533f8
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10720 bytes
SHA-256: 8882a8a3480b800edd5d8c978cc06b95ad8c095ff08f8c7b1265072e30eb5ceb

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