Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a2b478ff12133…

MALICIOUS

PDF

67.8 KB Created: 2021-02-28 01:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0f6d4c4c8b6a0686160459e001700860 SHA-1: 8c630d2d344cb2cf7b0e9b55669ca49ec8680210 SHA-256: c21a2b478ff1213357d045f160eb025432f13967048d36f7bc778f0e96a826df
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://resalured.ru/award?keyword=company+of+heroes+legacy+edition+fullscreen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368227/normal_602fe656ddb76.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/9ggjbn6/sword_draw_sound_effects_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/EjhZYRr/30675392905.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/fdihhd4/fake_caller_id_text_message_app.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/72ff5b425.pdfIn PDF document text
    • https://jofovumilaj.weebly.com/uploads/1/3/2/6/132681264/logodipitot.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/CigSidC/pounds_to_grams_weight.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5fc9917b9ba5e.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/h6Signh/44981288943.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/gorajikunobixi/dish_network_phone_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/46349171806.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/self_dependent_synonyms_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/68587768987.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_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 5576 bytes
SHA-256: 295dccc9414a6c70fcabd7b1163282199271e3e2131e59b9407ca19c3866f666
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10144 bytes
SHA-256: b5366bbb09e0c6256ac5b830caf6556a8df69bbfa7fc13fb1170f0640ba9e12b