Malicious PDF — malware analysis report

Static analysis result for SHA-256 c745cf5f5d2162c4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 00:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d88939d36ff8d6474f26ec187dc08c8 SHA-1: d3721e912e18c347a286c59ef4a4993ca5e20381 SHA-256: c745cf5f5d2162c444fd2328cbc1d0c127b68c3508ee93f914ddeac1ae60bf48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user 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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e8a3593c---91343529498.pdf In PDF document text
    • http://simkoongschool.com/uploads/editer/files/15124957168.pdfIn PDF document text
    • https://partnermind.cz/images/files/xabog.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/485338073.pdfIn PDF document text
    • http://nova-auto.com/upload/32404889552.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/63518267842.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/fibafowizovipedezebumaf.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/zavimirulebukigaf.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fofedejapetotetusaji.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/77548371610.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/52201357564.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/92983707857.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/90725879628.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/gikopowugaka.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89593548088.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/44247379474.pdfIn PDF document text
    • http://goref.ru/files/file/5300733427.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/xivizudokabebasew.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/80312803151.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/jirowimeg.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/55195516508.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/sozepulabujebutezez.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/sezatu.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/28313904523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tomorrow+war+torrentPDF 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_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 17304 bytes
SHA-256: 1e83d60aec81f41143af2b3e85ae89dbac6541deaeafd1809370f10942889dd4
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 10012 bytes
SHA-256: 1dfefed5450f952e2904051899901f09a442f31b756d9c7b69bac0a9ee3d374d
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1