Malicious PDF — malware analysis report

Static analysis result for SHA-256 79894396e8d010ac…

MALICIOUS

PDF

87.6 KB Created: 2021-05-24 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0bf54bb654afd82382bd398cc2b58678 SHA-1: b8302ab18cd066d1c611f98a5c014ba3b3ee45a5 SHA-256: 79894396e8d010ac31577fe65d4c3af645916b0eff02fcfd6071d112fa692479
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 ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified an external URI and a redirector link disguised as a search result for 'how long does it take to get padi open water certified', pointing to the domain xezojetit.ru. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest it is designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+long+does+it+take+to+get+padi+open+water+certified PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393644/normal_60301e8383721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_604e74ed1baf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_604d7e00e1ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_605c155da9585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449789/normal_5ff16bdd3c115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_606da07cd91ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5ff024b7c4747.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/fikuvine/67996721821.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/lagu_ardina_rasti_kangen.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/m-audio_keystation_88_ii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/cash_flow_forecast_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296f2694-325b-46c2-83d1-a1b7650bb704/which_book_is_best_for_inorganic_chemistry_for_neet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6148e259-c616-4b5c-a2cb-135091939b92/ancient_greece_ks2_lesson_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f69628-3032-4768-a517-7beef1202c5f/19159203237.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/black_wallpaper_hd_1080p_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e13aeb7-d7ad-469d-8720-8ef93d2bd5e9/18_week_half_ironman_training_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232e0aa0-d8a3-4822-85c8-a1d7e1f6a748/longman_pronunciation_dictionary_for_upper_intermediate_advanced_learners.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/post_civil_war_reconstruction_period.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/91013545323.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_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 5440 bytes
SHA-256: d610bf7455bbe46156d64a1a96d67a163be52749c1cc2a0bd8e3280bc3fa3600
font_01_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 12852 bytes
SHA-256: 4c73355ae229aeb3443e1731c7681151680edeb044bc8c1e1d0d4031e35e60d8

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