Malicious PDF — malware analysis report

Static analysis result for SHA-256 51622f3e1becca09…

MALICIOUS

PDF

64.9 KB Created: 2021-02-18 03:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 366268b704bef7af82e1a3e0cc7f0504 SHA-1: 843bca15c198aefd6f13b529bcd9e930abbc04f7 SHA-256: 51622f3e1becca0907e268d7a3bca9b0496fffb5417001b771f21441e189fd01
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://jacksth.ru/wix?keyword=chsaa+cross+country+results PDF link annotation
    • https://bezulagoxirupaz.weebly.com/uploads/1/3/5/3/135347250/5abb257.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/cjeCjhz/50228741809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_5fd77b9e27625.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/63zqyRY/t_i_stickman_the_flash_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jigfij8/fruit_heroes_legend_mod_apk_download.pdfIn PDF document text
    • https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/f3f1196622.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/gQTgyhd/ziwokoborerajofebujuduj.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/seviziwobazadan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6026fc4c2d023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_600f7911e3db6.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/bejikefowu/nafavuxodaluvobama.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/gedowevoxirarafudawifed.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/ff14_fishing_guide_70-_80.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/free_template_adobe_premiere_pro_cc_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/livakurok.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/chemistry_equations_gcse_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/corporate_identity_mockup_psd_free_download.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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 4896 bytes
SHA-256: 596647c58b726e63884d6b2cf7366dfe04b5d8407853f4f405f89aafedfed849
font_01_sfnt_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 10632 bytes
SHA-256: 23e263083d6fa6ec15f2ae8a5734bac9f8eb670dafa7842767b5b3e1acfc3f97

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