Malicious PDF — malware analysis report

Static analysis result for SHA-256 18abd7684aa248b4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 11:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 12157234d83bafc836fcfee66b0bac65 SHA-1: 0a4a36d522cfee184f845b216c66c052a4735bde SHA-256: 18abd7684aa248b40e3fa14dbcc9fe7def693bd823bbaa55802229ea19587a37
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://jacksth.ru/wix?keyword=the+school+psychologist%2527s+survival+guide+pdf PDF link annotation
    • http://mamubisuk.mypressonline.com/session_horns_pro_vs_session_horns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fc8d0cda59d1.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/yamaha_portable_grand_dgx-500_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_603649119cfa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60137c523a3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_6020c1bc826ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5fdcc99ed5460.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/fepegusadobifugekak.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/setigafat/dd_tiles_3d_print.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/86813493798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ef8615-0108-4097-9cf4-9bd7e0078e25/joseph_prince_sermon_august_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39836eb3-0d8b-4d8c-8828-9cdd2beadc1b/putuvudisa.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_71bab944948345bb90ade44841373672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/aircraft_maintenance_manual_airbus_a320.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_335d92a70138428499b6828865635a7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3470aff1-6d6a-49bc-892f-58bbadae9557/rhetorical_strategies_list_ap_language_and_composition.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/art_birthday_party_invitation_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/free_microsoft_powerpoint_holiday_templates.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 5560 bytes
SHA-256: 3409b11e04388b4b588291469533587cdc52c63b43206285aad9959f0a3f5e5d
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 10668 bytes
SHA-256: 4112857dfad1c17a0441f4ad62fbf848895f97669909e11b3eaef47d5c33d701

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