Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc78e8421e7f08d…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 03:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d8d68601b96b5f98a97b31b8ae86a9d SHA-1: cd997f8359e8d3aa15b2d6ce6dd8b84bbf5f417c SHA-256: 8fc78e8421e7f08d553eb51d9b31852c92c72dc886822810ca49483f29c6aacc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which are on disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=gta+san+andreas+cheats+of+helicopter PDF link annotation
    • http://kanalizace-ul.cz/userfiles/file/vokugutakoso.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/fexuvixezi.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/sonavesuvukidokiri.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/mamubudegisaxukudovel.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/15132010041.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e246c1061ef05764abf4a248cca30934/24269210530.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedebovakogilebugapanid.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6b010041---58866827403.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/nupuganibipisikawoti.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/bizagi.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/tiwafufizegugowigatuborug.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/23610779900.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210926_519267847F952A3C.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dowegugi.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/27064185197.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/16726099430.pdfIn PDF document text
    • http://aurora-c.jp/files/files/57712493687.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/8149642144.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301c3745a30---90967912786.pdfIn PDF document text
    • http://htwy.com/upload/file/89513367915.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/78647105092.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/2315324782.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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 10756 bytes
SHA-256: e130d2d885c7c0515c5851adffd1d1e0ec1302fe479399e43b216aa6bb0e3bb2
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 17780 bytes
SHA-256: 91bc522cd92c610eb50c9ea2892d19f792030792e2b90bfabcf4ff1349214b6e
font_02_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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