Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d145f3b284cdd9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 02:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 657a530fbd7d31b6b846f1eedc949a3b SHA-1: 4b0e4b0339952f8649dc643fb89b9b2fab442252 SHA-256: 11d145f3b284cdd9ba24a1a7351df72f05656c730cff9a1a668d67dd557597a7
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, specifically as a 'Pdf.Phishing.Trojan'. The presence of an external URI pointing to 'zajinet.ru' suggests a phishing attempt or a download lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the detected threat indicate potential for malicious JavaScript execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=beveiligd+pdf+document+bewerken
    • https://cdn.sqhk.co/dutebevon/vhgGXig/adding_and_subtracting_decimals_worksheet_year_5.pdf
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5fe468364039f.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_60497bfb73191.pdf
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fcc797486d41.pdf
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fedd898655b3.pdf
    • https://cdn-cms.f-static.net/uploads/4421336/normal_600b8ce5e20c1.pdf
    • https://cdn.sqhk.co/tinukomafiro/A3Ghgih/crossfire_2_scope_review.pdf
    • https://cdn.sqhk.co/wedegetuso/Iajgnhe/steven_tyler_armageddon_song_lyrics.pdf
    • https://cdn-cms.f-static.net/uploads/4444646/normal_602f5dea3c310.pdf
    • https://cdn.sqhk.co/widexerun/hjJhbfb/87566720744.pdf
    • https://cdn-cms.f-static.net/uploads/4448744/normal_603f8ec5ed99a.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_60131ab0c70bf.pdf
    • https://cdn.sqhk.co/pigexebobe/djjRfij/primitive_survival_skills_build_underground_house.pdf
    • https://cdn.sqhk.co/sezabaxo/hcihyeN/saberforge_lightsaber_colors.pdf
    • https://cdn.sqhk.co/joremeve/bNCbCbR/football_season_2020_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5fe313bb968fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gebukil/romumefolow.pdf
    • https://s3.amazonaws.com/sinadi/bebutekotamekoxu.pdf
    • https://s3.amazonaws.com/tesapibebujep/accumulate_information_in_a_sentence.pdf
    • https://s3.amazonaws.com/lawakux/derivative_word_problems_worksheet.pdf
    • https://s3.amazonaws.com/rewepalazamiso/63835883776.pdf
    • https://s3.amazonaws.com/kozewuposoridil/lenovo_t430_weight_kg.pdf
    • https://s3.amazonaws.com/kelageketisefuv/what_is_ruths_job_in_a_raisin_in_the_sun.pdf
    • https://s3.amazonaws.com/nabifovu/cccam_2._0._11_openpli.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_off0000eb3d.bin
054b12722926629b98464c7ab8c188fbe30b14e54bb56be762332235888ccb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5492 bytes
font_01_sfnt_off0000fdf2.bin
3a615405af7d84ae4ac8af265a6d6a882921e1190c9ad047a93a91295ddd9f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 11068 bytes

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