Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70df411b3a5570a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-11 19:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 541bab309007ccd97bd8e9c8ff2c2c3a SHA-1: bd3ae2ff7be134e3625702c0d7f322617342c0d6 SHA-256: a70df411b3a5570ae9bc4e609fa057c53a3713c79dd1cf7b71f4d86c0e107724
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a free download offer. The embedded URL `https://jacksth.ru/123?utm_term=teach+me+anatomy+app+free` is flagged as a potential phishing entry point. While no scripts were explicitly extracted, the PDF structure and the ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=teach+me+anatomy+app+free PDF link annotation
    • http://photoforce.ru/military_reporting_statement_formatzia0s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_60220f722fee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5feb69110496b.pdfIn PDF document text
    • http://dorightschool.com/xalexowezgfw6v.pdfIn PDF document text
    • http://adv-workshop.site/jaxirakuroriwed9oldn.pdfIn PDF document text
    • http://4kuhd.me/google_maps_satellite_street_view_20195a3wy.pdfIn PDF document text
    • http://arthromedshop.xyz/walkman_visualizer_apk_downloadh2zfh.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/jajuzasalikirut/arpan_sharma_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/tiwupebolenonubituweweden.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pixig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a34811-6280-4aec-8789-093cd61ba9d7/el_arte_de_la_seduccion_robert_greene_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1552c1-3c2c-448d-8e2d-286d902c2b58/sifakoxejav.pdfIn PDF document text
    • http://kituvofaxur.epizy.com/larov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dd20ce-f408-47f7-9d9c-8f228f7d4287/zinufodavalotit.pdfIn PDF document text
    • http://vaxutere.rf.gd/joniketolelim.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/2013_honda_civic_si_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbaa097c-2846-40ee-a1a4-3b244e4b2724/viledarinekurixin.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/monthly_home_budget_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/13551301039.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/vefovomozopuzademalupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155efd37-ccd6-49c0-a33e-97c457beff7d/nomijojudogo.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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 5096 bytes
SHA-256: 4c45a171b62c26465bfcaf5ce98556a7383b6621278ae1093fc0920173782397
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10100 bytes
SHA-256: cf6b0f1f59533ee72075d3a5cc352f8bb4a0ed27eed6e45fd2921264679c2788

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