Malicious PDF — malware analysis report

Static analysis result for SHA-256 10070ec1e234bc96…

MALICIOUS

PDF

92.4 KB Created: 2021-10-06 16:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 50f41cc80e47b274e02b93f58a22f511 SHA-1: 838417e95f2d3c62078868aae4f166c7317724d3 SHA-256: 10070ec1e234bc969f49ec362485abcfdabe8fb38beae4c9d27aea5e684c1c43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=starting+college+essay+with+a+quote PDF link annotation
    • http://magooferta.pl/uploads/fck/file/13361981195.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/21494546874.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219261652229935.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/xojorilududuxaxejogoxuzoj.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47603992209.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/otapppcn8r3pjc69qj8ekutomg/fewotetewokoxogezu.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/5007564593.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210918140924.pdfIn PDF document text
    • https://izometal.net/mm/file/22304676487.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/folirobofidoteki.pdfIn PDF document text
    • http://timocomputer.cz/files/file/kuvujukazaduz.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/42405799331.pdfIn PDF document text
    • http://rapet.hu/files/60565386348.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/40109680586.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/guwelugujilowa.pdfIn PDF document text
    • https://expomediainc.com/upload/file/wikelovesererabel.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7212e9d10---lepujoludiludanimudunagak.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/bosejururisine.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/32508706650.pdfIn PDF document text
    • http://rayanchem.com/d/files/rutonefupuxarinanirik.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_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 11028 bytes
SHA-256: b4fad2e1f67108de50eab7d25dfa0aad2b1ed37243662b1c3a5307f553dc660e
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 17816 bytes
SHA-256: 6ba20408ec4f6a9f9267385f787a47bae4e81306732fb21c945be775138b6ad2

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