Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c02b95a4535238c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 22:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b5b9710b7d71437f5dcec321da8487e SHA-1: 007af4ca6e7d80d10e914d02456d3f837a722201 SHA-256: 9c02b95a4535238ccc9b1f9b87b8465eea4f85f4c4ef6f29b0ab31280d5b7f40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=find+the+perfect+haircut+for+your+face+shape PDF link annotation
    • http://shinaval.ru/userfiles/file/jipeledago.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/73647174958.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/13151767110.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904130103.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/27013185755.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/sutibeligikimexir.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/80834287866.pdfIn PDF document text
    • http://exosushi.com/uploads/files/xunuj.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/penaximaleporenuwudoju.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/jarotitufito.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/36626237336.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/50168107318.pdfIn PDF document text
    • http://wohingltd.com/userfiles/6741499496.pdfIn PDF document text
    • http://weingut-suppan.at/files/4103620799.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/dumufugaxoxofokeje.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/29170997822.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/toravozivepimu.pdfIn PDF document text
    • http://yensaophanrang.net/userfiles/file/nufokusodazefowokovix.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/96276226410.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/luzujefegexemenapati.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j79e5gm1945pponj8tos782tc4/tikikizevij.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/81790399791.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/66335530431.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/65663847611.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16868 bytes
SHA-256: 0248f2338596578dc8c7682d7fd171ca1b9a07b4139d40e27bada28a1aa6d9ca
font_02_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10864 bytes
SHA-256: 2d32c10f73f152f26eceb72b874f67ce7c1661ff138fedd6b5231cf05d47d087

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