Malicious PDF — malware analysis report

Static analysis result for SHA-256 c362c4f151ad8a8d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 14:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 371e5edf2baa97eca0e63fb8986e71cc SHA-1: a75da682d4362677a720dc521d2d80114e079ac6 SHA-256: c362c4f151ad8a8dc7fae9d3c3ada49b5c6fb01f1c8694c21bd00a9b10bea6c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the ML classifier and ClamAV detection point to malicious intent, likely related to phishing or malware distribution via the embedded links.

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 https://tenshinorchids.com/FCKeditor_upload/file/13828901520.pdf In PDF document text
    • https://nevisnews.com/userfiles/vapemobewasilufo.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/22588797846.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/77690639714.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9d03a7a1---57889039143.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/71595926320.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030652012390.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/xadefitezogerivugutekotig.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kidelijuzuwiwepapose.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/94346767689.pdfIn PDF document text
    • http://potlista.com/file/files/botiw.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xufiwefezegulavesexaxo.pdfIn PDF document text
    • http://artospace.com/pics/file/jowavetobiwozojajimizolig.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/fizamesaravaba.pdfIn PDF document text
    • https://defi128.com/userfiles/files/rabiboz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m3nv575kiv0l9epmk1ll17jrv2/88364823132.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49902217125.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/81760262799.pdfIn PDF document text
    • http://poliinc.com/upload/files/28259421855.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/62589932599.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906190318818.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/perimoba.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wenepevabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sociology+nursing+book+pdfPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 18272 bytes
SHA-256: b22326f5fdd6e41c64f2eedc95b1ac5660470b63e61ad7f7337a0f3adc721bd2
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 10924 bytes
SHA-256: 765d800b7e7289fd15feeade68ece1b9e460145e326d883cb852ca2fa5466ffe

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