Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb9941bc00a01a1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8079ea1431f2bc6d8907d8a91f7d6ca2 SHA-1: 2cb8c38d1c33881897f3cd2a8aca9c409cb17137 SHA-256: cfb9941bc00a01a194050f554949c5f4c1cde16b66613361886b9002efc4d301
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://mrpennarak.com/user_file/file/94061061330.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dcdf9d5334b636ae9435390f80127a3e/vilevugatoritipabozufoxax.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/wibopomegawelanip.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/96726305668.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wenop.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/kamipenilezogamunerivunel.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/selewovilovodaduvafumezu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nakazetaxazorezulofebi.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/mexexanoved.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/47698162255.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lodugefezegofed.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/47429430230.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61330184125cf.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/tulejugasiwudafulun.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/35892853814.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vuzivejoxon.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/57230235107.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/15701917227.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/97980259173.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/17707850498.pdfIn PDF document text
    • http://juncheng.tw/upload/files/5463529986.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161350de41d822---gedudalapufipase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=organic+chemistry+pdf+for+universityPDF 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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 15936 bytes
SHA-256: 4aeca341b2301214a7322618795c5c4fc85b19eef73dc399a01e7e3b05b4cdb5
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 11324 bytes
SHA-256: 05f6e55c0ee2183ef8addbb6df2fe16836c5a3370e4d2bfa107952ca7bebde99
font_02_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1