Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace8f1fdeff68962…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 04:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dc5525bdc5267935aeca964c2ed6c68 SHA-1: 1ab4b093f3b755cd045ca7f3b11865043955484f SHA-256: ace8f1fdeff68962694b51288bd575f71bd35ec42f75b78f083233bf01648594
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=acr+call+recorder+pro PDF link annotation
    • http://noxsun.com/jingkelun/userfiles/files/20210917011702.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/pedovakozepudezidoj.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/13616784598.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/zoruvezunudide.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e88e55fe85---27464876463.pdfIn PDF document text
    • https://fond.ru/userfiles/file/zalibirawipujarixonewelu.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/505570653.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210917_001828.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/45540304694.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/6751623101.pdfIn PDF document text
    • https://rinducm1.com/contents/files/sabetu.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wigexubuluxo.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/67349754580.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/vazawidasasizininev.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/56975615986.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15484170356.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/vekikuxo.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wekefe.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/pawojikofokezi.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/38814112181.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10024 bytes
SHA-256: b8210583e636980e403fe479b14226cd351c7a191014f2a81f9eeb0c1c07d006
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 21496 bytes
SHA-256: 9debb4d991d62306e1fe844a561ac8d187e23da5e38fd488c3713a394aa76c1c

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