Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb7e49412bbd0c2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 15:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c558781dea8a7bba8b862e19efa8bf11 SHA-1: 9d612b71551177e6a58f7e3995190803170bc700 SHA-256: 7bb7e49412bbd0c238fe5a247056fce2d0026ea9beeffb6d694fb738efd76bec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the links suggests a spearphishing attachment vector (T1566.001).

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 https://crysiq.ru/uplcv?utm_term=parcelable+data+class+kotlin PDF link annotation
    • http://huseyindurmuslar.com/images_upload/files/67737303969.pdfIn PDF document text
    • http://adriennemason.com/assets/files/53559098917.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161319fc4bec7c---75590217812.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/58962407633.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/54160989471.pdfIn PDF document text
    • http://apsons.eu/files/file/sufivesokezevajitu.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/wuzadariw.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/bikisupujanemimoxigebit.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/farodasobilozigalive.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/rexuperabuvid.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/41991008101.pdfIn PDF document text
    • http://meskerjager.nl/media/files/49492589804.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sfucn2iv3oe0h9itvgr07ei3vq/bewebazifegi.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kunupalijinone.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/56606873820.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/dulopumufogedomaro.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/46620025633.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/newutivozidelabire.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905080724.pdfIn PDF document text
    • https://codecs.ro/images/file/ruwisinuxilifosokumom.pdfIn PDF document text
    • http://mq-water.net/upload/48082785693.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/22523807987.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/petufavagivudexederim.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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 17856 bytes
SHA-256: 76893e9172ee1367ccb089f3ce0ded0e12ab7c6510d2fd1d46a1df450f87c236
font_02_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 10596 bytes
SHA-256: 1202f9d19bf580f9f2510ac815ee36db314c85af9427c403a9d0a2b8b781de11

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