Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bd8d950a6ed043…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 00:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008b51aea5841dbe6bd0c51d11cc50c9 SHA-1: 6aeaa065975cbe90ebb282e3d44cf54854417bb4 SHA-256: a5bd8d950a6ed0430b4b3a363d4649715159d8ffa367d1d41b2a39aae68dda17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, which is a common tactic for phishing or distributing further malware. The embedded URLs, despite some being confirmed benign, contribute to the overall picture of a link-heavy document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bridgeonlaw.com/filespath/files/20210908053002.pdf In PDF document text
    • http://imobilestore.de/userfiles/file/jabasova.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zupapumevofugapili.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/67392673686.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ab20dd5e5ce74b505012ac3e49935f5/fesonapozixa.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/13428963470.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/jufir.pdfIn PDF document text
    • http://njxinbell.com/upload/files/94429893347.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/ximevuwajenib.pdfIn PDF document text
    • https://redac.ch/upload/46267254699.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vv70hplgop7db71qldc7o7ltao/tikulutaxefedumow.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pizisapopibelifi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/mewijokapiredetifotiko.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dijusubuvonatizavu.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/47921691483.pdfIn PDF document text
    • https://spacio.hk/attachment/file/59928932203.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/vexuriripuwaxefoti.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jubomidofebunedetili.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/79113882086.pdfIn PDF document text
    • https://senfina.top/uploads/files/rosewadeko.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/75555457878.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jubejag.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/63619007062.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/velesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=status+bar+icons+substratum+apkPDF 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 10764 bytes
SHA-256: 523cc741f135f20e03133c98cf2a20006e616061f4a1c66133fb411eb4467a27
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 18956 bytes
SHA-256: e04dc3aba4075d7039e7c12f105748b52a246e4ed6eb8d68508d4af3e66cb397