Malicious PDF — malware analysis report

Static analysis result for SHA-256 683fa221a5612ff9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 02:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fff41b5b2e537ec9bdb01b9621466b76 SHA-1: efec7efe3f0b0b87e1707b52fa8a60207b788515 SHA-256: 683fa221a5612ff93305b6ca697f2251797b21e433307d1ca3bbd232622889f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are disguised as downloadable files, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely for delivering a second-stage payload or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=download+ultimate+naruto+senki+mod+on+android PDF link annotation
    • http://laiyi-art.com/userfiles/file/10214799334.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210920085334.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kumopaxabe.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/2938331585.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/vorafatodasobunitokorugu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140643cceefa---fukigodone.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/kegezulexejafam.pdfIn PDF document text
    • http://yepuco.com/uploads/files/28385134523.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/66690170187.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/munudanowitunode.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/31769411873.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910115332.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/lizedamido.pdfIn PDF document text
    • https://10fci.org/userfiles/file/gelafi.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/fitubifatenakikamopagug.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wilobunifasotovoj.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/66630336934.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/98880269739.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/65396440222.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631581513.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vubujuw.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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10688 bytes
SHA-256: f9aeed0b4ae8ec95d38160a7334d2c924796f9c470eef4d6b65366e861b84eb2
font_02_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 18764 bytes
SHA-256: 01c28d04ccb2389bd5d001ae4d5f5465a46b52dc188faa51c37d530604ed056e

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