Malicious PDF — malware analysis report

Static analysis result for SHA-256 6612477979e3bc00…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 18:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff408f2efcc66f1bcef8fbe158d2f356 SHA-1: 58c260876f945dff5fc7ff4404e6c6da98c752e4 SHA-256: 6612477979e3bc0011b363f592665a86c259682d46cedce44f306636e9532e76
126 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. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.koreayokogawa.com/ckfinder/userfiles/files/28747568622.pdf In PDF document text
    • https://robodom.si/files_vsebine/87727923176.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916060728.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/43403244160.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c34c79577a---zujokupi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210901_59A42636B8DB1197.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/71525470801.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/71336915498.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/23112276716.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/1580241557.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/sijemananukefofoxupo.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/93935738657.pdfIn PDF document text
    • http://sireny.net/share/files/36197716652.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sotedawomunix.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/63417212574.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/bisodakebetixuramegapifa.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/15026732639.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/72133260846.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71134295045.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/gowesosidokat.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/61304365068.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/fosiwilejadox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=avee+music+player+proPDF 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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10596 bytes
SHA-256: 4c401449f865af081280da8b4a3a701a44d43e42d6ccc3bd6f2d9226aa2b92c0
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 17356 bytes
SHA-256: aca2dde670d9976b519c4208b8f793b2367ce0c121a3fbc364a6b7b2aeb7a64a
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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