Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b12b0b7352276e…

MALICIOUS

PDF

71.0 KB Created: 2021-02-03 19:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 34c474183cf1b559dce840fa9c913fe8 SHA-1: d72d1f6824331f788417906c159cd39a61b3da74 SHA-256: 23b12b0b7352276ea9e7135404bf2119ddc900e6f738c719fb72dd538cea829b
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=electronic%20signature%20policy%20template%20for%20healthcare PDF link annotation
    • http://idealica-official-it.website/diafragma_definicion_biologia44uf8.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/4335117.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/vovuf.pdfIn PDF document text
    • http://italysummer.fun/4th_grade_spelling_list53fi6.pdfIn PDF document text
    • https://xuwutofir.weebly.com/uploads/1/3/0/8/130813860/mosafuzetanine-ruritevoxe.pdfIn PDF document text
    • http://twobigs.space/paxibamimorhduu8.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/hfIheJm/pejozixok.pdfIn PDF document text
    • http://pro-komp-master.website/manamey_album_song_masstamilanlymuj.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/nugelafunudan-maxezejukaviw-defurime-bumas.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/gajakelegeza/33533375006.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/seven_little_words_daily_answers_sept_14.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/super_mario_bros_3_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/adobe_reader_8._1._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/56184020072.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/forest_landscape_design_guidelines.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 5488 bytes
SHA-256: c65421fcd9aa3f09dd60d276e14e29b4de3c7cf2c6c73f1d2c100cf110ea0c94
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 10168 bytes
SHA-256: 9f5dc637b7b8a48f5512ce1b56e75a797b6fb85c86ecf01c8a6424cc8f6452da