Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd0aceacdfb2ec2…

MALICIOUS

PDF

70.0 KB Created: 2021-02-01 17:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 2efa751253a6d2c309daa1c2798c7e60 SHA-1: ae7dc0a726abe62e960eb3f0f060abad01d7b6ac SHA-256: cdd0aceacdfb2ec2ba976efc142f51802538ed996cea338596d3fc8bea03da5d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=finish%20line%20coloring%20book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5fcc382ac32e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fd31a0f738cb.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/MwhjjhS/free_download_game_bus_simulator_indonesia_for_android.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/segizebowon-xodujakufived-dotup-gilawowisowaka.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/bjiTIhj/70775037563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fcb11b14e252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5fe8e39dbb97b.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/RFaSheF/tournament_organizer_discord.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fdc549d93ae3.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/vipuxafol/39001291545.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/13098348573.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/54957123638.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/chemical_bonding_iit_jee_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/kewisejekagolas.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/puzetejinomedud.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5012 bytes
SHA-256: 54ff659fe6e742b1d6344353a9cd802365f2df6f5c2fcdb63358a5ab900905fe
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10116 bytes
SHA-256: ef9dfd095a471503bbcdec17f4596d7924fdd53c032c4b792f0d17668ed58d69