Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56d724d57228c08…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 06:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d6a181c21f0b5c17a2b4e2bcef68d37 SHA-1: 85736981ed0fe5a3a2427ee1a71d13f702607c77 SHA-256: c56d724d57228c084d36f1d5ece14d64f18b20fcedfb3534e62e271f9900c08e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate the PDF's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=tiktok+auto+liker+apk+download+2020 PDF link annotation
    • http://tw-sincere.com/upfiles/editor/files/9813762026.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mikuziwusoj.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/35789781690.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/12621952445.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/46336875156.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kemejesibimasizimojazo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613170ebc5781---ditopoxuboral.pdfIn PDF document text
    • https://buka.ru/sadm_files/xevapisidi.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/jevaxipu.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/93739125643.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/31068480162.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vefinukel.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/49822954725.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090109043442.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/40983894185.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706244688.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/19911694822.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nifabiwaz.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/66306666142.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314df076103---duvesetidaf.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/likogonekudixev.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/68346099950.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/43303584075.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_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 16644 bytes
SHA-256: 406b35d4efbbb82ab4b1bc95e712454bd178adb716605cfc12da79919da3883d
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10700 bytes
SHA-256: 63847fc761a8a016bb263f5d6123c0cb4d849342783ba2e3fd53e1121f142273

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