Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfebe36cb928825a…

MALICIOUS

PDF

69.7 KB Created: 2021-10-08 06:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cea5cb015cb34e8644767ec4d9c2d485 SHA-1: 77ad5c8d0b82e6338ad4a42039a13717a284b906 SHA-256: cfebe36cb928825a18df8c86f6b802d0e9186f81b387c31e6696226d77dde481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, one of which is hosted on disposable infrastructure. The presence of many unknown URLs suggests a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allseasonsart.com/uploads/fck_uploads/file/24526730828.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/machihbncg35h0njacrovp40lu/xeberoxokenemumaju.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/2297689259.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/89654785112.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59702490996.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/ribimepowop.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/59004778372.pdfIn PDF document text
    • http://strahyi.ru/images/file/pijizojipiwuxiv.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/segura.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/lunuvuwabonugixef.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/1379185187.pdfIn PDF document text
    • https://777mto.info/contents/files/wemozumaxifam.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/31379366398.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/79332927118.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/47060340679.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/96313194934.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/bororemonama.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/jimesevilupobazalobepelin.pdfIn PDF document text
    • https://cet.sk/res/file/32574686199.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/25758464970.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wewuvupajupivo.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/vuxedevid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=print+odd+even+pages+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 10696 bytes
SHA-256: a5c025276d71cb5aa7e2323b3df122802f5418c0339f55d6be138bf2df2be773
font_01_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 15628 bytes
SHA-256: cc88ea0495fda078298780a5ae0a30447442be3bc16e6c910c3358d369100b2e
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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