Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d81c4bc4780fe26…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 21:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: d96c01b9cf2d0e83909a1dbbe303c0e6 SHA-1: 5ad760c31021c47c225b9b69a338eeeeccc07e96 SHA-256: 3d81c4bc4780fe268e54fb2f76b2c21a4090953a70dac24e12b6adb74f72b69f
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/wix?keyword=velocity%252Facceleration+calculating+average+speed+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472501/normal_601cf4c3c0847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5ff4968869b20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408709/normal_5fef908009454.pdfIn PDF document text
    • http://axecheat9.xyz/inoxia_stainless_steel_backsplashpwof5.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/jojajuro.pdfIn PDF document text
    • http://big-ita.space/25563428323d2lti.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/OiiibRu/rome_total_war_2_cheats_pc.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/2555601.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/belopudevuzuza/blu_ray_player_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/bahamas_heavy_normal_western_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/puvigusosusesokuxup.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/fire_safety_plan_template_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/35192645520.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/felifidipigaroselusew.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/kentucky_drivers_license_written_test_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/fifajipevex.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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5656 bytes
SHA-256: 4e941efd17f5fd805785d7a503609f1b02d2bef8e17d5f0b670fb8220afc9736
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 10040 bytes
SHA-256: 90b3c5fb91c4f4b7baf553673cf965884c120079e5b15c40442277fcac3aeb50