Malicious PDF — malware analysis report

Static analysis result for SHA-256 31df84fccb8052f0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba7f70d0cf531dafa1462a2c5b19682 SHA-1: 4ecdc7c08d333f1c3045cd813db5cdf2ffbe2c05 SHA-256: 31df84fccb8052f0b0e40b07cae1d804decb1c4f65f35aff0abd58265779e064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample as a link farm on disposable hosting, reinforcing the phishing or malware distribution angle. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=adobe+pdf+reader+apk+free+download
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nkjd8cisd2c2obaq7pvn2352hj/26665523166.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/futifiresapurazobo.pdf
    • http://ptaki.info/imgekoprojekty/files/77219824191.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/84436865254.pdf
    • http://files.ibiza-ferien.de/file/96510850095.pdf
    • https://ruta.hu/ckfinder/userfiles/files/josufovilazavupemufax.pdf
    • http://adacu.org/userfiles/file/20210903101829.pdf
    • https://izyskately.ru/foto/ck/files/97693410627.pdf
    • https://tasleemdubai.com/userfiles/files/madiw.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bapinolerelitujimo.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/gijigorevosogefeso.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161434824065ea---rezovoledewipixezinedibu.pdf
    • http://auswallendorf.de/userfiles/file/lawirafekidinoze.pdf
    • http://sukhonthip.com/file_media/file_image/file/tovizerinadivofirisikodek.pdf
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/zaporilugor.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20460517255.pdf
    • http://markone-tools.com/upload/files/59460917940.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/68873179699.pdf
    • http://worshipedia.net/sites/default/files/file/duduzuzejujejo.pdf
    • http://queenart.kr/userData/board/file/640907007.pdf
    • https://bushregenerators.com/userfiles/files/zopulodogemakolitaw.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/51000036165.pdf
    • http://resetimpianti.it/reset/public/file/50216492295.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/nolesevosofugona.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ef.bin
5d0fbab4cdf261f3ecd8ad1c656c6a5e572f1c3106ad6ad170b2e74d20c154ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EF 10432 bytes
font_01_sfnt_off0000db88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 16792 bytes
font_02_sfnt_off0000f39a.bin
eb4a49ee124a9d09147b61929ae62dcc86b773965b8305994671bdfc246a187c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 16876 bytes

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