Malicious PDF — malware analysis report

Static analysis result for SHA-256 333d2257fa1f2af4…

MALICIOUS

PDF

97.9 KB Created: 2021-09-20 12:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5eb07fb15665763d6f7fbb5b3bd762b4 SHA-1: 2905b098072b91d150203637f79ed2da4163d063 SHA-256: 333d2257fa1f2af45f2ec5fe80dac9b8112b668d4a167eda7f7908969785a7a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://unitec-egypt.net/userfiles/file/wagijeranan.pdf In PDF document text
    • http://goodlife88.com/uploads/files/58180175350.pdfIn PDF document text
    • http://pk.mo/userfiles/file/65493012480.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/tubigagadawax.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/dokofosudasusuwatewevux.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kifujolopub.pdfIn PDF document text
    • http://dfanchem.com/upload/files/53393940037.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021912548442060.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/rupesiner.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/lijomosum.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/79951285304.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mapusu.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sekuzusodadutomuronenukos.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59686925361.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/64630744642.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16538cfc4---47742913279.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/5936657729.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wojogurulasizidojerosedad.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///14518673637.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xenovujovuga.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f7c859dc2d448cf08144b195affe439c/90231828741.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/82902538032.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/35949503500.pdfIn PDF document text
    • http://freetds.net/userfiles/file/9919374316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beautiful+classical+guitar+piecesPDF 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_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 20156 bytes
SHA-256: 0d67f144a7217627f5ed6791b788b70e726961bd4060993c67f30f572b6478ba
font_01_sfnt_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001617b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617B 10584 bytes
SHA-256: 2143e9166dcd65ba9906e06662bc6932a83e752e724c28273bbb76a31826e466

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