Malicious PDF — malware analysis report

Static analysis result for SHA-256 add4d270bc71ce29…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 23:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46e27b5bd7251257a020d43fb8e080ec SHA-1: e2d680380b26f47afc116603c934260e15665186 SHA-256: add4d270bc71ce29c6b27aab3087d3f8a0ef0345f0e41905748b988f8b7b38f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure malicious links within a large number of redirects. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

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 http://cuatro-pr.org/sites/default/files/file/9994146215.pdf
    • http://rana-international.com/userfiles/files/rutufibazuwozapavorap.pdf
    • http://comp-art.ru/userfiles/file/pitodelujedosirilepim.pdf
    • http://moscowprice.com/content/xuploadimages/file/18444058483.pdf
    • https://equinox-e.com/upload/UserFiles/file/49130447282.pdf
    • https://fwstc.in/userfiles/file/36236968540.pdf
    • https://glaskunstcentrum.nl/images/file/35764953931.pdf
    • https://ppntassone.it/dati/upload/file/57481338664.pdf
    • http://elosc.com/upFile/file///ITX202109221747298918.pdf
    • http://vetsnab32.ru/userfiles/file/8543860918.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvr3qp2m9fs36ap6vjjr5kerj3/81923935890.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/4841898613.pdf
    • https://seeandhearbetter.ie/img/shop/contents/gafameredigazusa.pdf
    • https://pachetedeturism.ro/images/files/76927325851.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/megexefafolilabe.pdf
    • http://kaie.org/userfiles/file/20210918130349.pdf
    • http://helder-effect.nl/userfiles/file/24722894446.pdf
    • http://tbeaindia.com/userfiles/file/49444271601.pdf
    • https://maychieuvinh.vn/upload/files/jowuludefatukilum.pdf
    • http://magnumprint.ru/upload/files/tinala.pdf
    • http://antichigelsi.it/userfiles/files/mototavuwe.pdf
    • http://www.77ice.com/upload/files/65686909476.pdf
    • http://geotersrl.it/file/zonijuluwoliramo.pdf
    • http://faradtvandor.hu/picture/userfiles/file/70617354382.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/puwufisiwovawap.pdf
    • http://altronic.pl/!mag2011/userfiles/file/gejilo.pdf
    • http://galerie45.com/userfiles/file/rezalojam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+watch+the+middle+for+free
    • 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_off0000d164.bin
e0e3428008b9eb32cd07edb9db2735fe23bbd235a8f97e356c95dcbab5b6efbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 10548 bytes
font_01_sfnt_off0000e96a.bin
2e4209fc1b6e5b06d0c9c759d7283e2f47dab9baf37834339a5aa2063ee70f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 19060 bytes
font_02_sfnt_off00011b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes

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