Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd9802c3cf72681…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 12:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f14e63d9322699a7bbb561f17843c7dc SHA-1: ebe93ca5fadf9944944f81f584a86260400a3e0a SHA-256: afd9802c3cf72681261f5ecd08ae79fd577491eadf565f7bd3890c86346023f0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, noting the document's structure is designed to host many links on low-reputation sites. No scripts were extracted, but the presence of many external URIs suggests the primary attack vector is luring the user to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+leaf+green+unlimited+money PDF link annotation
    • https://burstallconrad.com/editor_files/file/zafegemoxulotunugit.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/gelas.pdfIn PDF document text
    • http://knipia.com/userfiles/file/10456971639.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/mogus.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xajopazikulutago.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/1655374261.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/82549853446.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/tujisepumidef.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/24775518874.pdfIn PDF document text
    • http://chengzechem.com/upload/files/buvonovavukaxosuni.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/xofudepumazepive.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/18492816135.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/80848051266.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/2480716334.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/zarewimeviz.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/62456966743.pdfIn PDF document text
    • http://kccmaul.com/files/files/81626703258.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcbd76dc15---dojubomumofux.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/genonet.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/48876418031.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/38825925891.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/99416305446.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/sonarokesaxiwafanawejagap.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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 17888 bytes
SHA-256: 7b822dfb33ee8ab4495e569989e30bfab59994889057181374bf214c96d1a3e2
font_02_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 10836 bytes
SHA-256: 72f69d6c89a2732934bbbbeebb2aeb1ca6381a56ecec66e24208a29fe03c6566

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