Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d768a5129a9090…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 05:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83e1e57cf561645cd273d152d945e90c SHA-1: 02408c7b15ed4f70609bc101fb4929d64151c798 SHA-256: 83d768a5129a90902acd4eb8af1d98a72934312851fdc9ad8bbba36cd9f065ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to disposable domains, disguised as search results for popular software like 'Among Us'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly analyzed for specific actions, contributes to the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huyndaicaudien.com/upload/files/22030653609.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7cf40dc3f---65435956655.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/rigozejelobamemijaraxuko.pdfIn PDF document text
    • http://placc.info/up_image/vusibisaxufajaxidekiruwe.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/bisejorogofezuvebovuzifum.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/8254078893.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pazumolebefam.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/witejogexexovoxalaguzodo.pdfIn PDF document text
    • http://annabarons.com/files/files/fesojiseloteloxuju.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/relata.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/75557807723.pdfIn PDF document text
    • http://runhouchem.com/upload/files/10931826084.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2937c7a57---18121383784.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/mabuf.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xofonoxesukigese.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/fenigaweponibofetuj.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/dalavujul.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/tuvadofelexoninusubuxawi.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109120151092920.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/6599635999.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/33103068253.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/rorajufazapo.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/95577011066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+among+us+in+laptopPDF 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_off0000b2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 10692 bytes
SHA-256: cb88301919a120aaede5c637c659fd3df8ec9bd34444470dab9690331bd93417
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 15988 bytes
SHA-256: 64f1b315d8fa988cce908548d3bcafaa437075ffc33820532547908eadf400c3