Malicious PDF — malware analysis report

Static analysis result for SHA-256 da11485b10c2625a…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 12:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d25eead61d03c6bdbd9dcb34c35cba4 SHA-1: b1de5d4fb8ef47021752bb7d1c7a077e766167af SHA-256: da11485b10c2625a878b58c1c80d7a2bd4cb6219f06cb58102ecab89bb731489
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'bologen.ru' was extracted, which is likely used to redirect the user to a phishing or malware distribution site. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=2020+a+class+amg
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6023099427ad2.pdf
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5ff8a9c7687c2.pdf
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fd0f739c2c84.pdf
    • http://yourbigdick.space/93271644634ph2q1.pdf
    • https://cdn-cms.f-static.net/uploads/4496151/normal_6047911e8fd4b.pdf
    • http://zomenonezuzup.iblogger.org/80677637442.pdf
    • http://jubogori.iblogger.org/multiplication_word_problems_worksheets_grade_5.pdf
    • http://alerma.ru/new_carnival_games_wii_secretsjendz.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_6027f3f5a9e71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zenejifawulo.epizy.com/bizerba_slicer_gsp_hd_manual.pdf
    • http://gorosojipi.rf.gd/what_is_the_process_of_breathing_in_air_and_expelling_it_from_the_lungs.pdf
    • https://s3.amazonaws.com/jidosatikim/73752277833.pdf
    • https://s3.amazonaws.com/godewumazek/4976208698.pdf
    • https://s3.amazonaws.com/desenaz/bogivolu.pdf
    • http://mirajiletumumi.epizy.com/47845269238.pdf
    • https://s3.amazonaws.com/sugosubexez/what_is_light_absorption_in_physics.pdf
    • https://s3.amazonaws.com/pasutiz/2665907440.pdf
    • http://zujexig.epizy.com/93299937971.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfc.bin
9208ac3eda225f5103b8f2628f517172fc9002a07463177ae603afcd6c2c834b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 5200 bytes
font_01_sfnt_off00010e99.bin
a26d0aa5038cdab16b234af4cc0806afcedb52f6e454e824468a4ae242ecd691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10768 bytes

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