Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3201b5028b14962…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 19:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8a9c369c6bd9ee904a771931da4e1bb SHA-1: 5537698f891b8af518ada05972f85a673d904c68 SHA-256: f3201b5028b149623afa90ff3b81a0945194a4aa2bc032818b7356968d5c397f
126 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. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of malicious intent, possibly to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://bluelakehomestay.com/uploads/image/files/80900505175.pdf In PDF document text
    • http://usatovl.ru/upload/fckeditorfile/25227748532.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fulowolirovuji.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38124229689.pdfIn PDF document text
    • https://mimpidia.com/contents/files/xenawivezazis.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/25507858993.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/sivakigivekafaneduxos.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87617212261.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/fuzulutirimotawar.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/10557216264.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/57052397675.pdfIn PDF document text
    • http://baoveantam.org/upload/files/6068549347.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xijerulobezepipakirimidol.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/28158915107.pdfIn PDF document text
    • https://cardolf.ro/files/77257215342.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b16db9e71---3215177398.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/51654255553.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/bavinemilemuwivupe.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/47966437486.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/25906058979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=outlook+2016+calendar+not+syncingPDF 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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 15516 bytes
SHA-256: a2881afee2447170cb40c4a53301b2f117b404efd7357533ebf89fff6c57ffe9
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 11340 bytes
SHA-256: dffd241b2feb714ced0529943ced32b63093f24420b4bb02b689c1f6e45f51a1

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