Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13c68553eedc552…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3415177d7cddab399e8ab733fa8cb8cd SHA-1: 2d9df16b8a648e859af50a437f3133b47a902ef9 SHA-256: f13c68553eedc552707c956d06449ed68aad28e7f7dbc5d7589fbb65ec0ac1e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 http://tomei4x4.jp/js/upload/files/saxaxaserivenala.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/73506077421.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/jevegewunepiwa.pdfIn PDF document text
    • http://sivam.pl/files/file/gekekatalelif.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/rufamimifowemoj.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/18114628557.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/35868485752.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/70363301052.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/85135527591.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109091159292574.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/73019548623.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/89905355004.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb53c6ed8---34460842051.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/51169256563.pdfIn PDF document text
    • https://izr.fr/files/wexereberamux.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdfIn PDF document text
    • https://sadex.pl/fck/file/saduwazixuvutafanexidurim.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/12983050420.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/movewewifidanovevawo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jumixunudebidetasasizeb.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/49220966820.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebab5779e---45632190840.pdfIn PDF document text
    • http://mc-opony.pl/files/file/17298340288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=5+plane+shapesPDF 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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 9976 bytes
SHA-256: a1613212942f446a89aa42680f5d6da9eb3d9ac6e4f97c3916acb7f5c2d6ee5f
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 15068 bytes
SHA-256: 531f50acd494a98b62330714a50991c2258d05457f4f763325a13df81ac2caf0
font_02_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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