Malicious PDF — malware analysis report

Static analysis result for SHA-256 2282f865cfb3ea25…

MALICIOUS

PDF

73.6 KB Created: 2021-03-15 21:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 904d979818f70b9e3878aac4d4f9269c SHA-1: b1269f3594f2bc6d1e60c25addcef5f7665d15c8 SHA-256: 2282f865cfb3ea25216c33af8712a8ffbe67ccc73de64cb5df5204d5d75d256c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a redirector URL disguised as a free download lure, combined with the ML detection, strongly suggests a phishing attack. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=printable+knife+templates+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd677845841c.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/macbeth_synopsis.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/what_defines_a_classic_novel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_60324e23dc940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6020672768e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470543/normal_60049ca02b25c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe5aa4be010b.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/risalenefazozo/bayesian_belief_network_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/49421699371.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/4p_marketing_plan_template.pdfIn PDF document text
    • http://fumibilulad.atwebpages.com/tipos_de_antibiograma.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/95803040543.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/sotapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa554f1e-de3c-474f-b386-ca96411fa43d/how_to_sleep_without_having_dreams.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/83172606945.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/amanah_dalam_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/sijuvusidezado.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/best_ab_workout_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabe9d18-d75d-46ef-85a4-2c861b14601d/mclane_edger_for_sale_used.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/nccn_guidelines_benign_breast_disease.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_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 5392 bytes
SHA-256: 219e67a5478174538a4d5903b2a93e5dad86783fee7995a1ce3a4d0805bd632e
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 11112 bytes
SHA-256: 7819861eb13dacfe4f5ec32609d70d58d667816baba934e2c08a74c3e779e448

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