Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf88d3a91da4af07…

MALICIOUS

PDF

69.3 KB Created: 2021-02-16 20:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 73de7be0deddfd5a1819089f3f4302dd SHA-1: 2582a5313c7063660abeb7bd143ab531ce7fbaf7 SHA-256: cf88d3a91da4af07fbb7b5e92efc5c16beea3490d57cf2a7afce3e79218f7613
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://maypoin.ru/wix?keyword=chemquest+22+answer+key PDF link annotation
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/dodezuxupojo-xufobedujidabuz-nawap.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jjOOMv8/niralig.pdfIn PDF document text
    • http://lozejokewoj.22web.org/nodanizadikobemuturijeju.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/a0e0854a82add.pdfIn PDF document text
    • https://wewebaviwipi.weebly.com/uploads/1/3/0/7/130775561/wizavonu-ruxer.pdfIn PDF document text
    • https://cdn.sqhk.co/zawafolor/FcjfieB/sports_card_price_guide_book.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/ibmhheX/mitex.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/rokuwapesu/lajutanajokivowakazurudem.pdfIn PDF document text
    • http://kapugekemasili.rf.gd/android_studio_sdk_manager_mac.pdfIn PDF document text
    • http://jegovogetaferop.epizy.com/types_of_formal_letters_examples.pdfIn PDF document text
    • http://vegigekud.epizy.com/av_fistula_formation_post_op_care.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/lusiwibowuza.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/postgresql_integer_to_string_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/android_get_wifi_password.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/alter_ego_a2_book_answers.pdfIn PDF document text
    • http://revipopeguxasaf.epizy.com/8916364427.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/44838378543.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/accessory_obturator_artery_information.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_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 5312 bytes
SHA-256: 4d4dabf354a7a0263d08dd90b023a181bba29921e70e8aacd4d2231e6368a905
font_01_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 10204 bytes
SHA-256: 08093fe1fa24a7da30192f2e0f2fa15d9871a8d7eea486097570c32b3d2cb38f

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