Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e390f97d6b1b15…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 06:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99b0292083b77821fe093226c27b46c7 SHA-1: cbfd265ad7444f2e42a89478ac3162b01a1a1afa SHA-256: 90e390f97d6b1b158451bcdcf463b9ce4f7fa065706f3ce4a43b102b18d973ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a large number of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=twrp+how+to+use
    • http://sellmysayarah.com/userfiles/files/26887591678.pdf
    • https://fsreloading.com/userfiles/files/lanusemelitefepawo.pdf
    • https://xuantruongtech.com/images/ckeditor/files/35515104030.pdf
    • https://ddnepal.com/assets/userfiles/files/fubepapof.pdf
    • http://yejiya.com/userfiles/file/51440281281.pdf
    • https://dichvuketoansg.com/luutru/files/36685365155.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54476cf65---lukimexafakejejuxowi.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/15271323414.pdf
    • https://lesrimaudieres.com/images/uploads/file/memolivibox.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/47618734174.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/19676983740.pdf
    • https://yellowmangocafe.com/userfiles/file/fuxozidalelatobisateg.pdf
    • http://urotunisia.com/uploads/FCK_files/file/13535116291.pdf
    • https://doluhosting.com/calisma2/files/uploads/tuwokiroribotazuxitigixop.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/38183156207.pdf
    • http://kvbm.org/pds/userfiles/files/25317828587.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/68375537381.pdf
    • https://annekienlen.fr/imagesfile/ramikiripopimoxorukulid.pdf
    • http://dydlhx.com/upfiles/file///gosavimukulub.pdf
    • http://boothbayharborshipyard.com/userfiles/file/negozorifajuf.pdf
    • http://ryyw.com/upload/files/2021/09/202109020655512218.pdf
    • http://bygreenpure.com/userfiles/file/17908156883.pdf
    • http://bassbasement.org/userfiles/file/96897084933.pdf
    • https://firesystem.ro/imagini_ws/57761510441.pdf
    • http://xsteelstock.com/d/files/rogadunu.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_off0000e096.bin
51dac88d1d756f9b0517135214b6ae9398f29b53d03106a1d598e38e475dde70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 17820 bytes
font_01_sfnt_off00010f1b.bin
0f511ebffc6cd011b50fa7506df116eced665abde1dd2a04df84b201f11047d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10096 bytes
font_02_sfnt_off000125db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes

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