Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ba00573088bc92…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 17:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2b568339346c77c4625b0a2f81f41d4 SHA-1: 755a68f2ffa98799c035345ad5902821d29da27a SHA-256: 34ba00573088bc92144e1e6e9c6f64f10a1607b2559877238a75199af3f08b71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, indicating an attempt to direct users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://fabriziochessa.it/userfiles/file/fisobuladise.pdf
    • http://assotechne.eu/userfiles/files/52826574578.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/siwokisexanuwewov.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdf
    • http://vanillasky-ch.com/images/files/dirodiz.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81604024832.pdf
    • http://longtra.vn/userfiles/file/27011374954.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139349f946e6---sewedodab.pdf
    • http://artemon.nl/userfiles/file/tezajipamive.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sovipumawiluwaneguwu.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wimeripe.pdf
    • https://huaienclinic.com/uploadpic/files/lepizidur.pdf
    • http://eminenceinc.com/userfiles/file/69371608573.pdf
    • http://ondrejkocar.cz/img/file/vanojogoru.pdf
    • http://www.polni.si/Images/files/55531516336.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/3207126304.pdf
    • http://npas.ru/pic/file/zibolemopaxorubef.pdf
    • http://nuklearmedizin-amro.de/userfiles/file/xusigokaja.pdf
    • http://langyupharm.com/upload/files/67238232668.pdf
    • http://clevio.biz/fckUpload/file/71665911347.pdf
    • http://biolabsrl.org/userfiles/files/ketebemomeropage.pdf
    • http://www.huntsvillepr.com/files/files/13877404168.pdf
    • http://naphotelbangkok.com/userfiles/files/87192075378.pdf
    • http://congtyvima.com/images/Download/97668002378.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/06e2ded4ad8f1ab5ea676f4d8a4f3c4b/45647664701.pdf
    • http://doradcyprawni.com/images/pliki/99951986894.pdf
    • https://marblo.ph/app/webroot/img/files/98938430447.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+gfx+tool+pro+apk+latest+version
    • 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_off0000c9fb.bin
34c43be01281b59cdd27e9a3fe0b471297f3a6726ba4afe356a781c22400817f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 11036 bytes
font_01_sfnt_off0000e39a.bin
2d0702067063a5a2f93dfda376fccd2847ec226b3f9315cde84e0e3797fa2b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 21292 bytes
font_02_sfnt_off000119ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes

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