Malicious PDF — malware analysis report

Static analysis result for SHA-256 2569bf4ecbf2459d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 14:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2095759cdb04e70bbb0516d27aba2b20 SHA-1: 8756bf01df3826d4fae6eab0aacb8e3659ea89b1 SHA-256: 2569bf4ecbf2459d818c1f7d3ac643e254e1277e9b0dd7ffd59892787c429e61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mea-travel.pl/userfiles/file/9776472972.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/87924454751.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/46011617714.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/niburufewudodikesodeja.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/wuvoxaravewagu.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/16449243325.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/suwisemovuriku.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/37681745077.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/42380248450.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zedejiko.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/gotesovo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/15025855975.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/38295348494.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/vulepavaf.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wemef.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/42727330059.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pesexazilonazobeg.pdfIn PDF document text
    • http://skisun.it/userfiles/files/81284494734.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/gubamijumonuporenugizukaj.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/77118539711.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lidogagoveko.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614457766041a---40455892691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hydraulics+fluid+mechanics+and+hydraulic+machinesPDF 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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 17204 bytes
SHA-256: 3795f33b12b774caff99d6ba01f689ba9375b43c4f3bfc5f997cbec872c29f82
font_02_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10728 bytes
SHA-256: c8cc46d42f646ab0f99c4c450b1c4d81e42f51de68ae4292e4b9b5110eef4c3a

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