Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a496789bce631…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 08:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 605f028e5bc6506bd0ad9a1cb3a14df3 SHA-1: f67c9f487148a93aac7826de6987aa3cb8d4ac8a SHA-256: fc8a496789bce63120362cfe1d4d629abbc405832019d55395f206e98d16e528
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used for malicious purposes, likely to distribute further malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fuzoku-kyujin.jp/ckfinder/userfiles/files/62621240411.pdf In PDF document text
    • http://secoinblock.com/upload/files/79576828804.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/detanonagelexaxogajex.pdfIn PDF document text
    • http://carbonelite.ru/file/niwipopajobomeba.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/61444274591.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/voburima.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/10531169065.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/liginozinuxateti.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/13067678014.pdfIn PDF document text
    • https://iohrp.org/f_files/files/21056687198.pdfIn PDF document text
    • http://etre-belle.su/images/file/87908454369.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/74604071522.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lesejuji.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/rubivetep.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/63569445927.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/91003309115.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/befemilovijevo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/37003801979.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/16979305029.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/toperologug.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194411517572.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/lijug.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/62857896792.pdfIn PDF document text
    • https://tigapilar.com/upload/files/febekasukepadobepok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=monsters+inc+full+movie+watch+onlinePDF 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_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 10844 bytes
SHA-256: 426b6a1acd7e990343bf58fcf5674e41c218b9aff4362448eaec6d121280fd0c
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
font_02_sfnt_off00013fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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