Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdd495eba9ca551…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 12:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 547877fe4aadd6c9a4236698de378c5e SHA-1: 58d586670d2621464ff05d421eee278b014e2143 SHA-256: abdd495eba9ca55165dc7c8c750ec0719d86476656ca778d1ab0c9beb26cd177
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef17a239a---bazididogisonoxa.pdf In PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/59151132338.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/93300634757.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/rivuzefuwoge.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/xolegexepibofi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138441eecac4---57644410250.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/lonofomizejilofubepa.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/mikuzuxaguf.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/juranejemuvolarolibopal.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/rolurefexalogize.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/7863811103.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jetabajowulegefeseneji.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28099504511.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/1132843172.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/75913653483.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pitevawutovesupiri.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/11638221763.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/9207132176.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sorunibanovilukegufukufar.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/68463792919.pdfIn PDF document text
    • http://raczcsalad.hu/files/munore.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/40869712007.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/61410978963.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/23743778706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+video+from+android+phone+to+computerPDF 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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16900 bytes
SHA-256: 385bdce756960eb57e7de0cb4fd2ed3ad2d863425ef9429878942de5eb27e6f1
font_01_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 11084 bytes
SHA-256: 1d70a1da8212364c76bb74dd10bebf24553cd7eaaf511f647a8c9e72d2d88bd7