Malicious PDF — malware analysis report

Static analysis result for SHA-256 2848735aed581de7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 13:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69f87bbb7b477007a6caeb0f7b452596 SHA-1: 084c9153eb646e7292ba8f97119efd71f308ee9c SHA-256: 2848735aed581de71a93811f6bae6958a122b8ca62926a91bdbb8c8003e5b66f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://synerhu.ru/uplcv?utm_term=sat+subject+math+level+1+practice+test+pdf PDF link annotation
    • http://tsrmmessina.it/userfiles/files/bamaxazeguzudi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613130f47e7f5---gulen.pdfIn PDF document text
    • http://ailizia.com/userfiles/8464711280.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/73828529877.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sanurifawezilig.pdfIn PDF document text
    • http://marymo.ru/uploads/files/saxoriwatopikebitivovom.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/regovuvuxakoridisamiripi.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/nubekot.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/17754391481.pdfIn PDF document text
    • https://renewone.de/files/golusixanakebiruzedu.pdfIn PDF document text
    • http://fohow77.ru/upload/file/funokiwamejaroxelilewoxol.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/80343790583.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93b591706---63057604039.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/mumozememafomugesej.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/42223385535.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/4935750945.pdfIn PDF document text
    • http://norservis.info/files/files/28194256133.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/delasugabetisarewa.pdfIn PDF document text
    • http://tzsunup.com/upload/tozasavibesefilezovamo.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/96786272040.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kipiwizojavixulaxoporunu.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/62671020619.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_off0000b9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AA 16760 bytes
SHA-256: a0f00f9aa6993a66d8fd90320402699d1adcb0adb920240dd921420d229d6b56
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 11224 bytes
SHA-256: 20ae206febcff4c4aeb7c41778906079f06056ed316091f25297fdfb06ba7fce

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