Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3fc0a5be18d604…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 03:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb4a2bd3187351e10e01fb4f06cdb389 SHA-1: 76a3e145b7ea7f0e0c1d477005054286a531a12d SHA-256: 2b3fc0a5be18d604ddd20d33ac1c6c21b97abf33f485d178032c740c1c7c2b6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, likely used to obscure the true malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://soechi.id/userfiles/file/66829463911.pdf In PDF document text
    • http://baloneacessorios.com/_upload/file///sigilujul.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75693080212.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/pizidavajakalixupami.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/66130433192.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/xeletobonulanamuxamep.pdfIn PDF document text
    • https://grandegroup.net/files/80532495261.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/16823605248.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/71570631413.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132081358076---22539030478.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/20654128559.pdfIn PDF document text
    • http://cosyromania.com/media/file/80108120912.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/somefiko.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95153725439.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fexunibuzinigebaz.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/xabutetokebivexokatujopo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/41647951737.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jisuwum.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/lagewamuda.pdfIn PDF document text
    • https://hse.tw/upload/file/57656016355.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9506ebe0---21332715780.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/10777564021.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/digopulelobejebisalijolop.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/65919280205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=grand+theft+auto+3PDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 10456 bytes
SHA-256: aeba138f6484ca231645abd437c4f03a261248777e3d249e9346329fefea144c
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 17612 bytes
SHA-256: fcfcf4a98c47eb5f449019da88f6d7aaf8ed29a27f77c9d9484cf371277e3e8f

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