Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8be2c5b604bc59…

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 07:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2105395060887a2da7f5865c75dd5d3 SHA-1: 4c8b4032953b5c576018bdf5f8ee6008e19e8966 SHA-256: 9a8be2c5b604bc59770837361036ae8e0983c15aa036e98a0c44f741441f21da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e3737246---taduseropivo.pdf In PDF document text
    • https://webrobogo.hu/kepek/getegepurabupuxekojilodod.pdfIn PDF document text
    • https://abss.pt/userfiles/file/mupakep.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/kowakadiset.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/10222086830.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/34253406440.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/9971592377.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/81467859960.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jitaz.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/28509673757.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/2102927277.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/fexufisexuletuleriladag.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tovip.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/110317389415.pdfIn PDF document text
    • http://ministerium.pt/files/mukogixixuxifapanuvinifid.pdfIn PDF document text
    • http://otczenacts.com/media/files/91133038215.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/49698736012.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109102320407963.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447ff25b8e5---13396119788.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/59583014320.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zedaviwi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/minobejusovaborigirekomew.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=valmiki+sundarakanda+in+kannada+pdfPDF 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_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 20740 bytes
SHA-256: 66597d32728ee97b15d0ba3956403e757858a3c16f5ab463a3283c10fa3545d0
font_01_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C42 10468 bytes
SHA-256: 459a4c942c1adbf4c94d53dc920a4ab478ca20316bd78591873a08d0606365e5

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