Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadffdec361c7133…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 15:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c5f5ee6c50893fcf973d37fa3099ea5 SHA-1: 289489c8cb5ca1337a84636beb633c7dd21aa977 SHA-256: dadffdec361c713327f366edd5e22fcb0938069dfe83f5a1faccf4d1c9b24059
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=rules+chapter+2+summary PDF link annotation
    • https://cdn.sqhk.co/vugomupuzisa/fnGejgu/joramugidumiken.pdfIn PDF document text
    • http://iciko.xyz/novupotezelikagijuwodojkq12.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/ih6jhii/jufekizuze.pdfIn PDF document text
    • http://blancop.xyz/rusuxoruutswt.pdfIn PDF document text
    • http://promooffer.site/sony_blu_ray_dvd_player_bdp-s3200_manualsljdk.pdfIn PDF document text
    • http://devgm.design/how_much_is_a_rainbow_carpet_cleanerdown8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixisenusadat.rf.gd/10_qualities_of_a_good_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/2019_calendar_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/forekagatuposagawe.pdfIn PDF document text
    • http://vogijub.rf.gd/zezobabinetofizabipita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae25d5ae-438c-4a2f-a96b-8e564a4ef4f5/posexojibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d29f6fd-92b2-425e-a0c3-ab173821e18b/zutenazagulavuvage.pdfIn PDF document text
    • http://ludujefu.epizy.com/jenadeleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf77099-16be-4d2e-af9a-b1b881fc5766/what_is_the_meaning_of_curriculum_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b1c33f-be09-4905-8543-6b87743633d6/251943500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29722c5-6608-4d19-a03b-bf5738efbb4c/sagemcom_fst_5260_port_forwarding.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/biloxawulovopasetoda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5416 bytes
SHA-256: be788d56e7cb39653d3ae54e45cd43cded002c1bac409ce2decdb4e6a1d93027
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 2252 bytes
SHA-256: fcfb8f0e55ad9df5a1ad0726378e3a06894f11344b8aecece3a66ee94f149217
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 11536 bytes
SHA-256: 0134a702f594649065d9cbbe66cebc479013d2166d26e33d25edf95840b3ecd9

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