Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fff09a7aec4668…

MALICIOUS

PDF

65.0 KB Created: 2021-02-27 11:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 85c2e1ae73d4cde30271c8092786bcf1 SHA-1: de3f4cee8780797e80f73b5393333ec23f7dc292 SHA-256: c4fff09a7aec4668cd367dbec8da1051bea3712e5894de7f76f44933cd71c543
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://xajibur.ru/award?keyword=twilight+saga+book+set+amazon PDF link annotation
    • http://segwaywheelchair.ru/downloadable_employee_evaluation_forms_freeazla9.pdfIn PDF document text
    • http://boxberry-24.cc/68667333471lv0bh.pdfIn PDF document text
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/xojuzemolufopijabe.pdfIn PDF document text
    • http://genusttwsr.fun/70114286784335s4.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/vja9NaD/children_s_double_bed_linen.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/eibp7z0/85669782939.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/gjjjqJc/commander_s_quarters_decks.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jfxPdEK/17081171587.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/jFNjjt8/mens_haircut_styles_short_back_and_sides.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/cot7Uia/furies_last_escape_hacked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/iggseme/18701404198.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bQKqbgf/wuvirilubarasuwiwomuxifa.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/fDieNid/8147285883.pdfIn PDF document text
    • http://batut.space/hp_p1606dn_service_manual38qxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 5300 bytes
SHA-256: af9a188436c55c2dad691a1b3b324da23e1cfc360d989df958b5af606e8a3b1f
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 10000 bytes
SHA-256: fcc6f4bfcd0402f495473ce0bdfa18010fd6e48671431430bbec6251a2924df2