Malicious PDF — malware analysis report

Static analysis result for SHA-256 2777de42964a24ce…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 11:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd1601449382123d6532cd54ca47eb14 SHA-1: d5c8336f1d800f56074c19b2a635c293194b2be6 SHA-256: 2777de42964a24cefa7eb7f22a59da65618cd1a5c20c37f6c88aaf3e4b298bdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to disposable hosting, designed to trick users into downloading further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a secondary payload, likely through a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb0794dab---fupugiv.pdf
    • https://taperagi.com/contents/files/lezuf.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14327943580.pdf
    • https://tgvl.in/uploads/fck/files/41539334680.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/77856105724.pdf
    • http://lunaleo.pl/userfiles/file/pavizawokirodivaxowulumix.pdf
    • http://anpo.vn/upload/files/64414787708.pdf
    • http://youzedu.com/ckimages/files/20210909142358419812.pdf
    • http://puisan.ru/uploads/file/82760676262.pdf
    • http://rockefellersgold.hu/editor_up/73390944320.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5vumlim9j42ncv5hl3mm2ccdg2/lijeloruzulinazotep.pdf
    • https://karpataljaturizmus.hu/upload/73285196847.pdf
    • http://ipceurope.be/assets/file/97588193396.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19576102721.pdf
    • http://nacyc.jp/Upload/file/80922084546.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/nurereniferunudo.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50272812616.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/31651341011.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/jigasiruzikose.pdf
    • http://wagnerpc.com/userfiles/files/tidunevaxaladufegumafos.pdf
    • http://veterinariomauracotti.it/userfiles/files/452055036.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/52114416685.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/pivajakazowuvizor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+file+smackdown+ppsspp
    • 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_off0000d57c.bin
0f3c16467af7a941047e37f35b8978dfbeb0a703e20c032775699c6e2405e06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 17428 bytes
font_01_sfnt_off000102ec.bin
21c40148f30187b896dd9e595fe2eecd14550ac822fae7bfabbc4f7c78d9fcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10760 bytes
font_02_sfnt_off00011bb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16792 bytes

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