Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b641db8f40b105…

MALICIOUS

PDF

80.0 KB Created: 2020-12-29 17:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1e012c4c2803b3e7b66e8f6d64499c SHA-1: 140bf097d16e66acad1eecff850abb9e868b66c0 SHA-256: c1b641db8f40b105754ecb862619cd4e12c2199411ce4eaffa750ba0e1174204
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'trafftec.ru', which is a strong indicator of phishing or malware distribution. The document body is heavily obfuscated, but the presence of the external URI suggests the primary attack vector is to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=1.5+b+dressing+up+adverbs+answers
    • https://zazowabuk.weebly.com/uploads/1/3/4/6/134641257/jubelupuzab-zojonas-jikoviduw.pdf
    • https://nanezafukixepa.weebly.com/uploads/1/3/4/5/134526153/fopajoviwumeluxezizi.pdf
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/3999665.pdf
    • https://fovavizudaz.weebly.com/uploads/1/3/4/3/134375550/3323596.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f93e6acb237a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvevanepen/caida_de_presion_en_tuberias.pdf
    • https://uploads.strikinglycdn.com/files/72ef059c-cd94-49f9-8049-b255df212752/95740771473.pdf
    • https://uploads.strikinglycdn.com/files/8a6bcd20-cc0d-4a89-a3e2-b3a8e638d912/39245612283.pdf
    • https://uploads.strikinglycdn.com/files/792f6c80-d230-49ce-a6d3-336e70795aaf/multiplying_integers_worksheet_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/3f6dde9b-3e01-4fbf-ba9c-61423321d1bd/12610077841.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62d.bin
dc4441312fadc6067c7107d5a02a28080a8e924e5fe93295cca6556a4a254642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 5500 bytes
font_01_sfnt_off0000f909.bin
a95233240ffaf2d0adc8c32df5682e02abc50c0f0009dee08544924063519a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10936 bytes
font_02_sfnt_off00011e5d.bin
bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16076 bytes

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