Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d765d5c246ee5d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 12:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3c3a20473cf949b0e3aa2c18b76ac99 SHA-1: 8402339cc0c35db2a141a367ce9ddd807702d085 SHA-256: c2d765d5c246ee5dc0c99150cf9315d7cc6095c7d98eeb8a90a0c0c4264f40b3
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially disposable hosting, and a heuristic identified it as a link farm. While no scripts were extracted, the presence of external URLs and the 'download button' heuristic suggest the PDF is designed to trick users into downloading further malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ffa7e09789ee74a77bd77a73d0c8693/gaminurawopefuwubaju.pdf In PDF document text
    • http://gonvvama.net/filespath/files/20210909220156.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902215542.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613986235ee14---bimipa.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zutifebo.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/12086534781.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://villkasz.hu/editor_up/47635017994.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fukajozitobaf.pdfIn PDF document text
    • https://purefeeling8.com/data/file/15771354180.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/savoga.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/piwinitereluze.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/tigirefagutotoloteronuli.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pifirupovodorobofi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/divuzemilaxa.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/77972545866.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/tiniziminizuretijoso.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/roxojowatugidabop.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zabotefunefavul.pdfIn PDF document text
    • https://penal-garazh.ru/files/mitanuwe.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2666497851.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/2383375569.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/97149838590.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9669292456.pdfIn PDF document text
    • http://yanartextil.com/firma/files/17507466440.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/xugemikowijipuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+super+mario+64+multiplayer+romPDF 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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 11100 bytes
SHA-256: dc20a90a39d56e74bc87deb1666b9c1a555a2c84051bbb90e1cd4f83f1c0497f
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 18528 bytes
SHA-256: 26714835cae325c9d6fef08ea79783794c932276612df3146ea8fea7821e5464