Malicious PDF — malware analysis report

Static analysis result for SHA-256 f839264649c49ef0…

MALICIOUS

PDF

87.3 KB Created: 2021-10-15 23:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5f5ceaa6e4c9003da1dd68e661bfec8c SHA-1: 9c3f76e09ed69eaca8e8db376a8117de86ae80b5 SHA-256: f839264649c49ef0416550fcf3b46fa260a51741b7962ad7f39e0c8c544b4a5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inciboya.com/resimler/site/files/34635461976.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161524ac5becf2---39634768173.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/58046650047.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/73219475845.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/17915328596.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zaxefenamepuxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155e3a9b51dd---kazobagofimelifik.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/jebaruwopef.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/29060920394.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/22819953046.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/72237893268.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/60272307494.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/wewufazexinofomegej.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/muxesuledi.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/minubedofifuzezivelime.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/wodiwolowukigajikip.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/63839619371.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/girikijujesat.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/zosafekowubezarow.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/262110399365.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=writing+formal+english+means+that+youPDF 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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10868 bytes
SHA-256: f272a58838140ec5edacde51a255b6e16b3721693f6ef73bcb3173804aac1083
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 17452 bytes
SHA-256: 1dbf925203f832b2dc4710537bf5eb57f3674d8e8a7d8f5ca055b5098ba8e212
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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