Malicious PDF — malware analysis report

Static analysis result for SHA-256 a178338b2f613408…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 12:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e9ad27ab0f5d311ccd9141b0e7f4db7 SHA-1: 69eff9eeb4d90708fbbb780b5e021d636665225c SHA-256: a178338b2f6134082d54234c7917b4f648ecfb53f23bd5ec6f163ccfc88125af
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://botokaw.ru/award?keyword=s%25E1%25BB%25ADa+file+pdf+b%25E1%25BB%258B+kh%25C3%25B3a', which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/award?keyword=s%25E1%25BB%25ADa+file+pdf+b%25E1%25BB%258B+kh%25C3%25B3a PDF link annotation
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/7980521.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gSicijJ/machine_gun_kelly_drummer_height.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/mapenomomozil.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/vhejbYe/38247062013.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/bxgific/quadrilateral_area_and_perimeter_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/fjgfghj/xijupunegi.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/YjdGAgj/dunotutugurefiwus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/latest_bollywood_songs_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/what_size_sim_card_for_galaxy_s5.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/lixofekefaju.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/65952602572.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/chambal_kannada_movie_free_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/big_book_awakening_san_diego_meetings.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_b103e11fd8ab4388b74c745c0b3e4884.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_1c0cc38fe7e84ffcb2b961879e9f649b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/millionaire_next_door_paw_calculator.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_b9bc4592ec5446afbc92783571e77934.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_f9cfa42a57df47c9b2a40747273b9443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/kodesowuwubil.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/how_do_i_fix_my_liftmaster_error_code_4-6.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5552 bytes
SHA-256: be5b248c308aea36b8cc735ee70df53d3232ffd86a11f8fbf14b5346cb8e945b
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 11560 bytes
SHA-256: 11a605f3e14de456937d76107916a878f89f2fca22b49769f704216263394572

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