Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b573de2c6494143…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 12:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dcc3d7f6d33f9c89e5593e89a304456 SHA-1: 618fa21ddf38ba07b8b82f7f657fc1f024c4cfe2 SHA-256: 3b573de2c649414376ceb394c1bfdfe61dfaf657442f0f216ad4065c0082d2e7
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 hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://psychanalyste-gard.fr/ckfinder/userfiles/files/14630240755.pdf In PDF document text
    • https://bakotech.at/uploads/ckeditor/files/55850203009.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/36852914891.pdfIn PDF document text
    • http://www.pvvc.cz/files/pekapuf.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/1045407088.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3927476229.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/91916506814.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kijug.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9baa644f230f64cc202b6a9a1825a34b/52435620816.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011548199255.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/40011459274.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nofoma.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/lifamaketedalifogixunaki.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/wojumobeku.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/webetijasedixum.pdfIn PDF document text
    • http://tcihk.com/userfiles/30204617328.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/76304189630.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/72349703126.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/36980794583.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nopuwupulupaserefomudux.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/73346150693.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/rakomubavevuruxigapinuwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+k20+pro+latest+software+updatePDF 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 11120 bytes
SHA-256: c187abe50f9d02010bb74bce7cbe0500251ec62ad1572890c341b9c72ac6dcb9
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 18328 bytes
SHA-256: fe6afc448e745f689a8f157c2223565f3a34a214cf96a7eab9fdbdd7ea96b093
font_02_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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