Malicious PDF — malware analysis report

Static analysis result for SHA-256 910898d47c9381a9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 07:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 363bed5cf98d6d79426b5db8e6367097 SHA-1: bd63b440beacd2e03faa636fcdecdd3dcdd599c2 SHA-256: 910898d47c9381a960185f410c36bd9d553cac2e7e7b2d524bc24661420e188f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://emenu.hu/editor_up/kuvavukuze.pdf
    • http://vinhhangvien.com/upload/files/69268091264.pdf
    • https://ww150004.linebot.net/upfile/files/20210913151423.pdf
    • http://robwalker.net/fckupload/file/gojewonapuvisuzawaxegapok.pdf
    • https://hazeloyun.com/calisma2/files/uploads/28887659535.pdf
    • http://imssp.by/data/images/fxeditor/file/18928455740.pdf
    • https://familienbilstrup.dk/userfiles/file/8132481736.pdf
    • http://zonwering-belgie.be/ckfinder/userfiles/files/tuxeb.pdf
    • http://pyramidplaster.com/file_media/file_image/file/58360735363.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/16854476965.pdf
    • https://hotellemaritime.com/hotel/upload/files/71397566150.pdf
    • http://vertex-decor.com/userfiles/file/99523729101.pdf
    • http://sys-svinding.dk/userfiles/file/dobozidofavafaxemusijaz.pdf
    • http://biomehl.com/images/content/files/jilizavefopusofapolaxe.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/08/nunenubovego.pdf
    • https://xn--90ah6akb9e.xn--p1ai/f/file/8860825408.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/57589563583.pdf
    • http://aczelzalog.hu/tmp/54032044868.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/80053470489.pdf
    • https://sukhayurveda.in/userfiles/file/18608078279.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sikusadawobipov.pdf
    • http://eikenhorstgroep.nl/userfiles/file/jikixete.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5514283636.pdf
    • http://handsonmontessoripk.com/userfiles/files/pivasawamag.pdf
    • http://modernplating.com/userfiles/file/48279361660.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupape.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=omegle+chat+alternative
    • 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_off0000dba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 16792 bytes
font_01_sfnt_off0000f3bc.bin
96afa1660541f641db50306d0689168a5b5042e5184d898d92ffabfafd05e3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 10480 bytes
font_02_sfnt_off00010b61.bin
d7c449eefe1afcd4cfd79bb8f0aa1859082a876ee0cad7d8b18c50362af66a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 17340 bytes

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