Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5c5eff74a0df98…

MALICIOUS

PDF

66.5 KB Created: 2021-02-09 07:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8511212eab90026fcca44286924281b5 SHA-1: c50ff16ae5463030555e290e9cdf0a9e2da9e49f SHA-256: bf5c5eff74a0df9869e5e34ce32cb39f6d14b9c7b4cd0f3b8867b1a9dd29c5c3
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/123?utm_term=2017+ap+calc+ab+frq+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fccfa01518b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_601fa770ae611.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/hRjihcD/army_pt_standards_score_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/iigjjid/jurassic_world_asian_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/iiSfTha/pirokawijijixefitoxude.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/hbgf7AQ/rafuxopixuziralibipizofuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_601376ebbc3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_601e4a9842940.pdfIn PDF document text
    • https://cdn.sqhk.co/nubowolimit/aV3iihc/tapekopekubaxer.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jg3igfA/99675025952.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/wozowuledij/fuwagisekegatof.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/tolerutosebokikabiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/bkav_home_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/best_tactical_rpg_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/cd_full_form_in_medical_term.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_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 5408 bytes
SHA-256: 20b01b211771ee31b9422e0ab2d124de26bcf2509be8abdb8ee5cdd48a375e88
font_01_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10420 bytes
SHA-256: d4c0ca10202330a42c90dbe285bb2992bf0203c9802f015f2036052a268f50d2