Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0488f9f5ceda50…

MALICIOUS

PDF

85.3 KB Created: 2021-03-28 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef01b6c5ee1a90f09656645db3976499 SHA-1: 2cf9e251d5d2d0586cc580b639d9387d77193c92 SHA-256: ff0488f9f5ceda50ba64403b84b65e2c5418a1a3ab2b340280dfd2f4d63005f8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many of which are benign, but one points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=vizio+2.0+sound+bar+-+sb2020n-h+reviews
    • http://luminar4-download.xyz/75096254199b6zle.pdf
    • http://metryck.info/peter_atkins_fisicoquimicaj1xc2.pdf
    • http://hempmap.ru/1_m_cuantos_decimetros_tieneoyv6y.pdf
    • http://crawlmqyu.space/microsoft_mvc_tutorial_video0dvxt.pdf
    • http://meetchambre.xyz/irregular_past_tense_verbs_list_printableqg6vt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d6279982-ee6c-42b3-a1b8-564d562ef19a/stihl_backpack_blower_br600_best_price.pdf
    • http://nisoruv.rf.gd/carcinoid_tumors_test_reports.pdf
    • https://uploads.strikinglycdn.com/files/bc75ea73-9461-4c46-9791-4194b948fba4/how_to_connect_my_jam_wireless_headphones.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_d01323c1ae414261a31e2c5ebd3de89d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e89dc75e-c944-4a0c-9ab9-c2d19f3f36d3/the_torah_codes_end_to_darkness_by_filmmaker_richard_shaw.pdf
    • http://xujamaxopubisa.rf.gd/auditory_processing_disorder_checklist.pdf
    • https://uploads.strikinglycdn.com/files/f118609a-8489-4759-b85d-b995bb664647/how_to_stop_climate_change_at_school.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_c8de74623eb44b7fb594b2aa15f57ae6.pdf?index=true
    • https://s3.amazonaws.com/jawusawar/lexuwurisavopogolikofag.pdf
    • https://s3.amazonaws.com/zagubip/cisco_dwdm_sfp_datasheet.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_7edffeff5f8f480b9bf723e756d47d1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40d2b0c2-773d-4095-a546-10850523f519/papigenokeletis.pdf
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_1c76cdc744b34b71a155eef4e562b9a7.pdf?index=true
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_a3f8dae85da64417a107b841cd442c90.pdf?index=true
    • https://s3.amazonaws.com/kubedukowug/gisiduzenijopotonexuwoloj.pdf
    • https://uploads.strikinglycdn.com/files/c38da447-7068-465f-ba9e-db5eaafee9cf/rya_sailing_rules.pdf
    • https://uploads.strikinglycdn.com/files/bcc04c5a-6bf9-4e9d-816e-22383d01f507/canon_t4i_price_philippines.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010033.bin
c386d99aa18a1c491f5b68072507cefd7243642302ecbe7cb6b378ac51b077e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5328 bytes
font_01_sfnt_off00011259.bin
010cef99f47522d6b16a98452cb4780aa0f303d3013fcf2d1ed6f9a44e81328c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 11052 bytes
font_02_sfnt_off00013801.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 4324 bytes

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