Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd23b4cdfec4e08e…

MALICIOUS

PDF

70.2 KB Created: 2021-02-22 16:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a6b22d0e6ab145c34e1f34e36662f37b SHA-1: b937d3cd1a5464aea5440154ffae47474029344d SHA-256: dd23b4cdfec4e08ecc19b488871d829f5f0692e341af7c4a5d40ce2afef92438
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=facebook+worksheet+template+for+students PDF link annotation
    • http://antonio-ita.space/44818472001i7v67.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/jhiijGd/call_of_duty_warzone_map_changes.pdfIn PDF document text
    • http://bobr.space/the_science_of_mind_management_bookgoa32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_602ade6b17d50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fccd64f964ce.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/bhbwgc2/51135121706.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/8830031.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/xuzonut.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/eiKizhb/fifa_world_cup_qualifiers_standings_2019.pdfIn PDF document text
    • https://nenafefetu.weebly.com/uploads/1/3/1/4/131406263/pelemufuruwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_602a9a59c0fbb.pdfIn PDF document text
    • http://winwites.space/ninja_foodi_air_fryer_toaster_oven_reviewstpc96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_6008f59d14ba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fosawef/wacom_tablet_software_bundle.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/cancer_de_prostata_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/vuwijinuxavofi.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/antares_autotune_free_vst.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 5480 bytes
SHA-256: 5232cb683e63eb94d931502259023905e913dbaab39abdfb44aa0b87c22ffd23
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 9892 bytes
SHA-256: 5f315122c0405ae562b1caa9606199f4e82a1baa9a1a1f36ec63b73a15aba5f8
font_02_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378