Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e625dcc45b2e9b1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ac2137edf5a90bf0332a931851f8c16 SHA-1: bf356575979e03886d3f3de686c0482f438ac978 SHA-256: 0e625dcc45b2e9b18460df5954f71986346f389739b2c86b2efa205f78a717a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://study-abroad-travel.com/ckfinder/userfiles/file/kejiwazusijonazivuf.pdf In PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/xuzirekokowatekas.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9232b435---dexuxavubadurul.pdfIn PDF document text
    • https://mbbs.hr/files/bejupikozitirupumeg.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/65920619754.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/47638461361.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/24437813112.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/nesodawaf.pdfIn PDF document text
    • http://rayer.cn/d/files/kudexonuvasi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vonuzun.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/wobawagajeseke.pdfIn PDF document text
    • https://triosms.com/userfiles/file/37944780652.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/nomoguwesu.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/surijap.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/8176950562.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/zigovelefujuwif.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/77718014031.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9556140088.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nojipulesoded.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/rurotufagejinaretadoburi.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/munasisokegalerow.pdfIn PDF document text
    • http://sentralperdana.com/file/wijazimika.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/texob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=screenshot+touch+apk+for+kitkatPDF 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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 17260 bytes
SHA-256: b246bcb69f98f1e1b96bd15739bee5ec279c33e70bc37b502c1277d783a9ec78
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10796 bytes
SHA-256: 677aad7ce6aeec65df6c7762b33f2767c13f103984a0eb428db0db813e3774e2
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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