Malicious PDF — malware analysis report

Static analysis result for SHA-256 5174533247adf4ad…

MALICIOUS

PDF

75.7 KB Created: 2021-10-08 02:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b3c1d3758b9a6d7acb956054a4710d2 SHA-1: 7063eee996776e17e9bf340656b6733c196bdfb1 SHA-256: 5174533247adf4ada90193678235a32c8a655016d0540dd6092cb1dfe565674b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to distribute content or phish users. While no scripts were directly extracted, the nature of the embedded links and the ClamAV detection indicate a phishing or trojan distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://studiosimonepantaleo.it/userfiles/files/zutiwosugetitu.pdf
    • http://faradtvandor.hu/picture/userfiles/file/18090744710.pdf
    • http://vandofigueiredo.com/userfiles/file///lajariliruvazobavutijaj.pdf
    • https://valve-toho.com/userfiles/file/43462349829.pdf
    • https://exihomes.com/userfiles/files/dejuropufimo.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91895938033.pdf
    • https://ratodua.com/contents/files/48217380080.pdf
    • https://dienlanhhonganh.com/images/pic/file/fevumofikatipepa.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/mamutitonoxugimibej.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/40732313914.pdf
    • https://morganmethod.com/ci/userfiles/files/49233495379.pdf
    • http://markone-tools.com/upload/files/69803913628.pdf
    • http://www.somdattabasu.com/fckimages/file/vulixit.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wonawivotani.pdf
    • https://heritagecambodiatravel.com/userfiles/file/xowaxulibutelijewifupoka.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/mekibised.pdf
    • http://kleinschaden-expert.com/userfiles/file/13080988356.pdf
    • https://strongpointmarketing.net/userfiles/file/58128166961.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a709b28fe---bapofesemifogotebalet.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qad0n4iv25h56tk20h4nvdajpc/bewigi.pdf
    • https://billard-hauri.ch/userfiles/file/76573209848.pdf
    • https://bellcera.60km.com/upload/files/16727973016.pdf
    • http://epoxidice.ro/mm/file/81386558884.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+high+society+1956+online+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_off0000c016.bin
01753151fa4480f23f1dde3a3f6299fe398ec1db2d1847fdd5d4c11e862bb424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 18004 bytes
font_01_sfnt_off0000eeb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
font_02_sfnt_off000106d0.bin
3576341db9e3e3a7488fd1801bb62a3c7442884a49c56f65ffef63761e88e593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 11244 bytes

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