Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68fa8f51950d495…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 18:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 172b975dc7069ccf04b9bd13e81c6ff2 SHA-1: 36e2f661e450fa048755b9209567cd5fe421a70a SHA-256: d68fa8f51950d4952cfde1fb48f4e43417e63d7b7f98bf759c4cb311576e1848
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown URLs suggests a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ukkies.be/userfiles/file/baxogotatugera.pdf In PDF document text
    • http://fitviewer.com/files/file/kovisebijuzuxiwu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/84693899031.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/19759420786.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903103329.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/tewalinun.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/jidekojaw.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/pofoporonugagejonuta.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/79982804830.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/jekulabapoxegadoluzoza.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/jiberijalevinalivugufe.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090700095460.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/fonefukajefuvobuxuxosiko.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowobilojilomivorokob.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210910105635.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/99539860177.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/79885224563.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/pagofopovena.pdfIn PDF document text
    • http://prograsifkalip.com/files/83926249852.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/gavan.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913121606.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mebojafiborovuvevivoras.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f54f29d0---57750197904.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/91178024324.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/woxovati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=custom+libvlc+options+androidPDF 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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 16720 bytes
SHA-256: 5857a4b70444b9cd3f43159939a756fd2d6f20870ade9e258f43876bb5066cb5
font_01_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10880 bytes
SHA-256: e2a7fffcc875603f3f8d088768d29b0f01fde881a6f9003532ab777addfd51d3

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