Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13119afb20c88fc…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 03:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86fd8c6f12a90e5c95eca4d8c8e06857 SHA-1: 00455e70c9b27aa50b5a48a3aeaa20b80ae4b59d SHA-256: c13119afb20c88fce4b65f659a4d1e7e19ffa8da966ff5703d127146ebc51a7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=beyond+two+souls PDF link annotation
    • https://audreyheselmans.com/_files/file/wazedili.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914104637.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130825333569.pdfIn PDF document text
    • http://linker-apps.com/files/wapuwunilumenodow.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108311922358936.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-1/20210901135807912085.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/79028074852.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xerib.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/47429441965.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/44187657193.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43159557337.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/doroxiw.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/46652527977.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/37096296844.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/titevofapejikokodivop.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/58001796134.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gidogozekorogebeliwafu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210906103651.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/61833903632.pdfIn PDF document text
    • http://minipit.com/data/files/zubepafoforukuba.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30344336444.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/82074577806.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d3e028635082e79c4a0a1e0d08b66f31/88037884836.pdfIn PDF document text
    • http://industra.sk/userfiles/file/koragugukobuziri.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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16708 bytes
SHA-256: 19d4a58bb29118184ad9a917d41704de3ab45380f55ca4dee59cf4b04adc5acb
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 10240 bytes
SHA-256: 5dcedcca38b661f70d69efeae06d0293996b46bf51051005b2438c9920bc7059

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