Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae57c5012149edc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e1cba7a5bf4c8b2277cae60a5499ee1 SHA-1: d7c0beada5a10f614dd88c8514c5a218a2b67768 SHA-256: cae57c5012149edc80131e1c9a847552aaeacd0973dbc2788386f98d64599dde
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a raw IP address, suggesting an attempt to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.benyowsky.com/resources/files/posulamapokimeseramapel.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0385bdb4---gobifewenuropugu.pdfIn PDF document text
    • https://fptica.ru/images/file/bofuxegupidikeb.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/57564502832.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/44390371836.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091311093273499.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zurufasin.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nekudizab.pdfPDF link annotation
    • https://mobspace.xyz/web/img/podborky/files/fesurufonawikowivesulak.pdfIn PDF document text
    • https://digicpictures.com/downloads/14408799454.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210907/file/16310123065436.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614643bb59fb2---67848073822.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/niwarejivos.pdfIn PDF document text
    • https://verner.lt/images/files/kawilemolaxitulavu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dotivowixeme.pdfIn PDF document text
    • http://hidropro.hu/upload/37371706317.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109132204569440.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xabinawudegekibib.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/29813730072.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/lamufomunofubedilotateno.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/makasumikibovun.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/foligalepabise.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/56408343213.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/51206826109.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/11029857253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=series9+watch+seriesPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 17060 bytes
SHA-256: 4befc08a2d272a3729e1eb4806bb27274517a0f9c04c82495bcf2ab6582ced96
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 10384 bytes
SHA-256: 65ff85ccdb78ee0a156cfb5532f7bbeaf20f16d615826c28893cdabb503d7795
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1