Malicious PDF — malware analysis report

Static analysis result for SHA-256 8512f5c358dcbb75…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 02:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b39eab483f14f0e6f436b725cd3e4d28 SHA-1: cef523cdd974144e10de4c95625c0f442247be22 SHA-256: 8512f5c358dcbb75d3f325301c7475f4599ea4f45ff969f99c651a3cf413337b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--q20b13r9leepaeb.net/upload/file/202109060614333994.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395d8cdfe66.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0b8d62f62ea2ee4c4f9ed409a956a2e3/25413117697.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/93149228231.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/sijivesinawuponiwazusa.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wuramigekosajigiluvowopo.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/13069799756.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/toriw.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/xubavapif.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/jezezoj.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/fugabokake.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/73915792060.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/virimas.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/sujal.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/87401679979.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/wugodigero.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bamofifidisodukumewefejor.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/17266782429.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/makokolasakulew.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/75133268014.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/28142379844.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/73931818034.pdfIn PDF document text
    • http://leeandrewdavison.com/download/zarogaxoloza.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/moverebukufejipamirebur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cinema+hd+free+apkPDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10456 bytes
SHA-256: 58db9c4c0cc0028d504b6c6cbe8c6a98d88ec634df3868107945aeabe1c8cc76
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 15512 bytes
SHA-256: e12d1ec2d622a24d7772a4d4ff387c11ba5c0f5a72b794cca6c976f5cb3e5a28
font_02_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1