Malicious PDF — malware analysis report

Static analysis result for SHA-256 81db30b4d0b34de6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 07:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574a11b358f72dd7e81ee4cd36309a25 SHA-1: e24ac14e494a9bfb788c2fff5c581238de505caa SHA-256: 81db30b4d0b34de65331c32cb25d9403cf900569ea4f549ba0530331e3578a57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://infrive.ru/uplcv?utm_term=astro+go+apk
    • https://rm-parketi.si/uploads/53304904350.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a2247648---59408867859.pdf
    • http://julianina.dk/upload/file/kifaxobagela.pdf
    • http://gloteckr.com/upload/editor/file/zetemokotazuzeliniraded.pdf
    • http://cartopack.be/Images/file/mafawamino.pdf
    • http://www.cavice.fi/tiedostot/files/76127653672.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/nupasegufogudedemive.pdf
    • http://titishop.co/upload/files/rumokamenevok.pdf
    • https://dalycity.com/wysiwygfiles/file/78330129744.pdf
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77814046736.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/dozojepuborefev.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bk554t3kkeopmm3gdpqtm257g5/kixujuwozeronepidosokoru.pdf
    • http://st03.it/userfiles/files/68299814950.pdf
    • http://elitaliaweb.it/upload/file/darok.pdf
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66545703613.pdf
    • http://huonglonghotel.com/uploads/image/files/6919331734.pdf
    • http://zenkatsu.dk/files/sizotupeposiremebinifoke.pdf
    • http://leylatoprak.com/userfiles/file/waradifape.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210903121958.pdf
    • http://saktigroup.in/uploads/keweta.pdf
    • http://energyexcess.com/userfiles/file/vololunomojepumu.pdf
    • http://carbonelite.ru/file/18475617661.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/luxunenazesani.pdf
    • http://nieruchomosciklodzko.pl/files/file/japut.pdf
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/kolizujegizawilul.pdf
    • https://al-farh-iq.com/upload/userfiles/file/99033757528.pdf
    • http://mixmarketing.vn/upload/fck/file/zolamuwozuvajobotozo.pdf
    • 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_off0000b2b5.bin
94eef715e2dea56e2436c41a74fb994d8dc6a5754f9f39a6dfe511ac99220047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 10124 bytes
font_01_sfnt_off0000c987.bin
e884b4e7ab60b5ccab8bea7c7179b5246506be61ebf58217b18513e7f82a840e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 14912 bytes
font_02_sfnt_off0000ef2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.