Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a1dfe154aae685…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 21:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 276fac59bff6f9f2a49d4c8a6407814e SHA-1: e3c4522723bcadbc0ef3bfd020ac3800710e5bca SHA-256: 71a1dfe154aae685db20e2275faa3a309585399f31ec4c689f1984d09ca8b402
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent, likely to lure users into clicking through to malicious sites. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fuoriscena.eu/file/57537015100.pdf In PDF document text
    • https://taucaotoccatba.vn/images/news/files/52556237333.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/japibuvenorumupujesere.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109051233505664.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4a067e1ce1c3319bfc17eda64e6e12f8/56023198705.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/baxapiz.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/16636872933.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/buremofuxepokinemakireji.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc93465559---vovipepu.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210902_192712_5881.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/navuxezifudoba.pdfIn PDF document text
    • https://fuoriscena.eu/file/lojatunemegabudekibu.pdfIn PDF document text
    • https://diphong.com/uploads/23728980100.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631310215_4c6c11a20b.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/jifasuwomugefana.pdfIn PDF document text
    • https://alpinashop.bg/files/talawujelowinenamodad.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/38709387782.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/6428621494.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/nesidogoxukaruxoko.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dexomenomivevopiba.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14147779853.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/41946188475.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/mojivedugimemibesamaruto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mi+11+lite+firmwarePDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10112 bytes
SHA-256: 825524c3d4a7403fb3df07e3c83fd5faa57bda3885639453d13eee5f9851626b
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 18824 bytes
SHA-256: 3e91ecf87544c20c516b67403b604bed9d5d2dcbeef8de6cf86580edc12a7aaf
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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