Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f65754a7dfb761…

MALICIOUS

PDF

87.9 KB Created: 2021-10-08 03:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d0c1258e05eb567a64bebf4bc7d50da SHA-1: 9e467dea240eddae596ce26c39a2e7394d0e940c SHA-256: f5f65754a7dfb76119bfa2abcfe172c6e14fe8a0ae412109811e31e34115edda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack vector is likely spearphishing attachment, given the file type.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://fsbulletsandbrass.com/userfiles/files/dekuxegefobi.pdf In PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/narokujazufuwexepipo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/31571597118.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/18152832041.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/53483859190.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/33106421307.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/79881371121.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/bugedigazotexuvoduvoj.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/zisowubadipadafilepog.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/notenasiwubake.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1d347f34---nipubizi.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/28998532977.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615f7b7472859---49098170817.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xalirawu.pdfIn PDF document text
    • https://lorus.rs/files/76732018959.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xosuxokonezatitunometu.pdfIn PDF document text
    • http://0048.pl/48files/file/37518230676.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xufiregemutes.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rarage.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/saginowufiparekobo.pdfIn PDF document text
    • https://jck.ro/userfiles/file/83716015854.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/58549040037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=take+the+minnesota+multiphasic+personality+inventoryPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 18868 bytes
SHA-256: 3fa10332cdd51179359c7f29b53ef63dd88f430e1abcde5b6d0d5c86994ad984
font_01_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 10976 bytes
SHA-256: d90f2308271cf7f9b4c0f638e8b83068416378c179948c5556239ad58a1478a7

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