Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53ef9798742acd1…

MALICIOUS

PDF

79.4 KB Created: 2021-10-04 20:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d77f70d03ad83a050500e833b9fadc7c SHA-1: 7289165b9a154ce8068d26b4763622f79042b3ba SHA-256: f53ef9798742acd1f140dbcc39d9e6f86f54c81128f0c7658f6e92b217c95277
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous external URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://nincity.de/inline/file/pitizopurefu.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/12671615111.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/51767619761.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/papavobovebisewakasewoson.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/55180175715.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/8050708004.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/mekixisunonitimuwe.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/23848325061.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/47115806172.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/jebonuwemewodonilab.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/42954906561.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/91397740207.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/rutaxajifojafup.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/monilorewiforawofoketobow.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/xiraretekubevigip.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/62235564106.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/42676682560.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267451613f---rumixikesetewijusej.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/77742447015.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/fumokatabirugala.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kozosogepimuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=telling+time+hour+and+half+hour+worksheetsPDF 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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 17924 bytes
SHA-256: 678a9ecbe1f1977c6c7a73601680b763f64b139eee838ec1ef21c5a8d56d2b31
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11044 bytes
SHA-256: a01b708d0a5be5d8772a5eac0f9c5db8491f09cbf2e9cd0b09334279ea2629ce
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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