Malicious PDF — malware analysis report

Static analysis result for SHA-256 aede9c747cdf6604…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02179b05766f50ce05a995001f672444 SHA-1: 020bcae3c997666cf92808c29624f50ce73b017d SHA-256: aede9c747cdf66046d7e70740e4ab4ff60b12cb7129173c08280ff4e7e012be5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://erpos.sk/data/files/63490099688.pdf In PDF document text
    • http://flightshop.jp/images/blog/file/13925499604.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/lelivoratoz.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613b7217d1aa5.pdfIn PDF document text
    • http://leton.pl/userfiles/file/kafovigedumesogejelifuk.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/31793140394.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f086df07---ponozununota.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/74215720052.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/nobosetav.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tovugewoxuj.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdfIn PDF document text
    • http://orderkai.com/uploads/files/sadusesutiniv.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/58637174680.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/62268358928.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/82706304883.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/97120159964.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/miximuwolilogam.pdfIn PDF document text
    • http://dnepropress.net/files/file/58347999484.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c5c7a5cd08678323a85b5f6842528a86/6589902847.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jodaxaku.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/94648936453.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igegorigojumiv.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/92261439529.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/30732548701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+pdfrenderer+examplePDF 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_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 16140 bytes
SHA-256: 7be477538393a8ad3351fa21c35a3c216377ea2599e4458765cfc2c5f6417c04
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10476 bytes
SHA-256: ace26d6750c7cbd499574247533f44155c2545028716af4158c8bd65abd26277

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