Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cf15b18124292…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 23:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f9ecf16fb9255c691ab237eb7892293 SHA-1: 317ca872b066c8089e46b3ec74ed876c298792eb SHA-256: 4c4cf15b1812429263840d2258a3d83ef37934a88c3ab6f5360c0ed5ed94293c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hide-bo.com/img/tmp/file/jetoxixubolirojes.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/28492896668.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vakizepaludemomol.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/dubogulimezunejitejus.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/woridadolixixixamite.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210918035122.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jogorerike.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50914902966.pdfIn PDF document text
    • https://solturism.ro/images/file/xamakutapajivixeramug.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/nifixonikeriputiviwajotus.pdfIn PDF document text
    • http://tfforming.ru/d/files/86799830287.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/zuxefem.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://infracsap.hu/files/file/vusebexizotomino.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/mirubuwepozegavapafikisil.pdfIn PDF document text
    • https://duvanco.be/docs/files/jipivinunoxugalepu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aace052609---55329855676.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/bunasoposekij.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/tonurotaso.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/51351741765.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pudowedel.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/judadowananadidalolo.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/jewomalefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spring+words+that+start+with+sPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 15588 bytes
SHA-256: ffe718352dc7b9c356c3c508802711c14698563699374417667634acfa1a2bcd
font_01_sfnt_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10652 bytes
SHA-256: 1f2d8fef74f9aa2451bce9000139074d820a1fbc2e30b7e72e24db6d27a76eb0
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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