Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e00682bd9ca419…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfc101856e1c344db69c9a365590fced SHA-1: 41e0df52fb46f18a1f5bf833dacd910463925e19 SHA-256: 01e00682bd9ca4197501a801104c398206a6b131a97efc049b024bc3e8e2a181
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 of which point to disposable hosting and are used in a link farm pattern, indicating a strong intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a sophisticated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=can+you+find+deleted+pictures+on+your+phone PDF link annotation
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/29978177922.pdfIn PDF document text
    • http://skomi.ru/img/files/file/komirelolobetukes.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/82129333479.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/ziwixuki.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/sabatajiname.pdfIn PDF document text
    • https://steammining.com/userfiles/file/jemogelavoba.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/25726620953.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd6e5f84c---9882444845.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/11688355205.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/17113234116.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139340937da0---192945948.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/62765135029.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/49651883901.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dawogu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/1335157920.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902071404359629.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19846191275.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/sidagovedoxutupupu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66554209491.pdfIn PDF document text
    • http://turatabor.hu/media/jamonisukuxofulis.pdfIn PDF document text
    • 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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 17476 bytes
SHA-256: e72307141ba44d8450519355bd10e762b00d69927b8bce61158ada5e30d2afeb
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10960 bytes
SHA-256: a2a2f1740d07219326506566064c42df0edb17005762de03a749994e65d97b27

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