Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e8a8f279d149f7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 23:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b171871a51f95968a163d694c330c2c SHA-1: a622262bbe07bfe8b3afd5ac301f4ed8a00662fd SHA-256: 00e8a8f279d149f7d59e29d541292cb62d8bd7b462b6c0a1cd76cc015e4a9d5c
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply an attempt to exploit vulnerabilities or deliver further malicious content, aligning with common phishing and malware distribution tactics.

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://jezirka-biobazeny.cz/UserFiles/File/gofemamo.pdf
    • http://hodori247.com/uploads/files/69437149197.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a64607beb6be8a0be7a00b57d1c0efef/biminip.pdf
    • https://mashtalkandil.com/userfiles/file/84324727202.pdf
    • http://csc-028.com/userfiles/file/20210902152441_03y0pu.pdf
    • http://vce34.ru/attachments/file/zuwujom.pdf
    • http://wernitznigg.at/files/13522645538.pdf
    • https://takipbizde.com/calisma2/files/uploads/zesuxejowolupulokovusuke.pdf
    • http://viettranslators.com/webroot/img/files/lebuzesopuvigozuxiba.pdf
    • http://robbes.nl/media/files/40877283627.pdf
    • https://detmers-kontejner.hr/files/retudetolada.pdf
    • http://bayanairag.com/uploads/userfiles/files/bovozepupe.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e7c6795ff10de6a79fb6df8f92f0c223/guzejefutazelapa.pdf
    • https://pontus-sd.eu/uploads/file/semubosemox.pdf
    • http://elitk.ru/_files/30282279573.pdf
    • https://champion-osk.pl/userfiles/file/ninewodi.pdf
    • http://h04ydivan.ru/userfiles/file/39943185734.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/67760637756.pdf
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zejifiba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=location+tracking+android+project+report
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
font_01_sfnt_off0000ecbf.bin
d4f31c383fd0d333010915b9a16d0328378e279e390ca01cadb4fe32e03b0f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 10656 bytes
font_02_sfnt_off00010508.bin
e7c603c137fbd9d6d6dff015ee769cd59b526cb87b6f782b47d40f69d3064ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16848 bytes

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