Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffaa1d1fd8fbd95…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 16:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c55e1dbbca62f90989777cdebefffddf SHA-1: 8e2eb431a229516eaa773f4f979d1ae0eeec4a0e SHA-256: fffaa1d1fd8fbd952cf6c0afcf7647e899ebeebecaeb03f4f9354ac158565ca8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=android+limit+wifi+data+usage PDF link annotation
    • https://detectiveoffice.net/userfiles/file/viliniwepada.pdfIn PDF document text
    • https://hobbypet.cz/files/file/46190595341.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/51152147851.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bazumibiduzanapib.pdfIn PDF document text
    • https://tomas-music.com/contents/files/noxobuzijogidevamelew.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xajaze.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/42931499142.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/63422420919.pdfIn PDF document text
    • http://hmed.vn/upload/files/85459970155.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85775111341.pdfIn PDF document text
    • http://premo.at/userfiles/file/buvuruxe.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/deruvofakofazolotu.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/50112393005.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6442408---wogedubifebanolunagozol.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/divajupulaxekepabukoxe.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902180937.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jawurozi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rawuxelebavuseg.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///49120295991.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/84452040375.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/zafudoladesa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906080604167.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/mepugekuzetovasajipakaga.pdfIn PDF document text
    • https://electroagro.es/pub/files/najadilivawinikagejizeri.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/saliwakatogenobibalugev.pdfIn PDF document text
    • 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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 17496 bytes
SHA-256: 2f7beed4e685e53b4a5889949eebd3af7d0b9882671dfa7e1d256d64c0db6544
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10864 bytes
SHA-256: 3f9fecc72b7823cf4122b2a29ab5cc567587d0810ea910422750e48d994359fa
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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