Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc3786825f4b261…

MALICIOUS

PDF

74.0 KB Created: 2021-01-01 20:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b273cd85c611b7d5900e0041f524fc47 SHA-1: 76ad32ec20a0e1c1058b8999f585e93ac34a899b SHA-256: 4cc3786825f4b26198a89c761abf95777c26ae121973370728f4f7cf477d24b1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to suspicious domains and identified as a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'traffine.ru' as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=funny+soundboard+sounds+download In PDF document text
    • https://cdn.sqhk.co/fuzokikili/Yvjaouv/pumutoxagazirixibud.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/fRhcpCX/natural_scenery_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/uMieAji/zugipoliveriki.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/2179564.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/pgdVjcr/fear_the_walking_dead_season_6_premiere_recap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5fbd746e618ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fb8dc4ad77d7.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/Tcz9KJy/apple_iphone_11_pro_message_tone_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b00357-a211-4e97-baf7-84f6ff3f4c38/dedixineruriwuwesowozekar.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/52418515350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbb9324-2561-4e5c-92b8-ef2b2b6f0363/xidumefuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb75fed-e1ed-41c8-9970-e11001ae5e1e/73512987673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e39ea5-ca40-4a05-aadd-4161dfaf6f3b/45033232403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ce39a2-714c-4738-8575-3ea8f8fb1ca2/bifudatewibud.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/fbi_most_wanted_poster_template_free.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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 3852 bytes
SHA-256: 3fbcc448144af8264ef994355cf19049163c3067e097e74aeffefb296c1eed99
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 5108 bytes
SHA-256: b0b8f82762aed545161a1784571b0e33ca0972f82ad94dd99d6815caa7a8313d
font_02_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10736 bytes
SHA-256: 48fcfc045853a3a35cb7141f173f816346328ccca47038b11e83e43654207ca2

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