Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7634f5de45b5d9b…

MALICIOUS

PDF

71.6 KB Created: 2021-03-03 16:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: be9aae08c3124a6769a1df0512b073ad SHA-1: 05c2a40be2eb26e44e38927bf4c02797320b7e9e SHA-256: f7634f5de45b5d9b5f4af8ec4fec211c666c4451d34d7ecaab84a10411e31d38
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/award?keyword=phrasal+verbs+come+worksheet+pdf PDF link annotation
    • http://stixlife.info/19195502944381dc.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/ejercicios_online_agudas_llanas_y_esdrujulas_5o_primaria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_603ab91dac35e.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/alcatel_3l_spec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fe089634a28e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_5fcbfcfde4d3c.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/tujuximodexajubizam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_5fe6682ac72f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_60122f781cf11.pdfIn PDF document text
    • http://getdouche.xyz/what_do_card_suits_represent5l4rq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc986a1d8c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_602c28fc97dc2.pdfIn PDF document text
    • http://sale20.site/why_dont_students_like_school_discussion_questions9m8m5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fe3aa19524d5.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/bilafinadad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ff24951b3851.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/werowibovezoje/autocratic_leadership_vs_democratic_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/yahoo_messenger_free_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/waxefopobitud.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/70528761777.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/billing_warnet_di_android.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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 5752 bytes
SHA-256: b9c5083493554fc8e757992c3716f9fc12de7fc618d87b2327196d9454747506
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 10632 bytes
SHA-256: 3e46ee77452979a577a8d67c5ee8c6a85f92585ccf311511a30cf44d5587edd9