Malicious PDF — malware analysis report

Static analysis result for SHA-256 3102f0f80805eee4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 08:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7de8d20eb8c113e00cbaf241a67593ea SHA-1: 974a99b2c5b177da6c3617f8dcbc7dda61251f72 SHA-256: 3102f0f80805eee4acec194ad7abf553e519a4175833496a75d626c5008af800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=can+you+video+chat+on+an+android+phone PDF link annotation
    • http://banquat.com/userfiles/files/46161722792.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/34007808879.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/60413978223.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/55172123069.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/29221384867.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210905122814.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/namize.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/wowepiwopokatixivu.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/76882814732.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912020325951420psv0l.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76346042818.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wixijenerewasuxup.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/nasirupewe.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614547489a7cb---dexabupufo.pdfIn PDF document text
    • http://tulga.ru/editor/files/63451500822.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210916_B65D9C3C6B3CA188.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/42137165301.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b504eabb---munotifip.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/bapusanulekisememosufu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/7257916596.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/bibilirubelowolok.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/bifenixifa.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/91428001485.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902103517.pdfIn PDF document text
    • http://keacg.com/upload/files/bubuvuwiganur.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17864 bytes
SHA-256: 35b4dc2eb25304042a3c0527e8f3ad0de11627ebf30b183e6bbc03c75b68e1db
font_01_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 10708 bytes
SHA-256: 7889e1165eb8a431d1b46976adb44178a8614c7f560217e15e097445d119f32f
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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