Malicious PDF — malware analysis report

Static analysis result for SHA-256 63df5016539a98d2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 05:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f0e61a6afa1e00ce483a81e88b535dc SHA-1: aa091bbad15f4cc454cf04e2a381c0541eab17ee SHA-256: 63df5016539a98d2a0b25bf5b482794e70437e8878e4344d0f33970706b96fdf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=free+sms+sender+apk+download PDF link annotation
    • http://medianet2000.net/amm_prod/image_news_popup/file/kezesisogeviwugenugu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/patuk.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/fikusu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/pabupepor.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mirusifoz.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/kubigapal.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/bojulusifevezefafoja.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/tumux.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/novujavigiri.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/susixogomonotiputolakaja.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/60965337509.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/bogapope.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/meboritaxewizavilodidoxo.pdfIn PDF document text
    • https://polandpools.com/contents/files/bojuwijobewaxusexunow.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suvezodezugedol.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/59270913574.pdfIn PDF document text
    • https://ever-progress.com/upload/files/82344170539.pdfIn PDF document text
    • http://secoinblock.com/upload/files/37484526859.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/14818080673.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jikebogarigewegorotomanup.pdfIn PDF document text
    • http://hejia-ele.net/upload/68347403762.pdfIn PDF document text
    • http://93564497.com/userfiles/6823168081.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_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 19996 bytes
SHA-256: 55309a2aedcec70e0111ca7d76ffcf93a91ac76958cf96fd1b54ffad7b5495d1
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10516 bytes
SHA-256: ed303fa8fef4cbcc648ce1b696253d13e9c5736ba495fbb23cb17fbb2a5fbfa9
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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