Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2afe1c9039bf863…

MALICIOUS

PDF

72.4 KB Created: 2021-06-10 22:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 140c21476f0c15855eb7ae30b2aa0dbe SHA-1: 856157531e7afbd213c0359e8a38366a70363602 SHA-256: f2afe1c9039bf8635b2b561f3fffc960d53ca7d553831ba29b3a764662ad546d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://laborke.ru/pbw?utm_term=free+instagram+followers+trial+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484358/normal_606079cbecdf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6046dfebe48a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5fe12e6e560b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6068c200aafd6.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/8d616564-3ee1-4622-99ff-ffe4a32027a2/80098641181.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/11023819972.pdfIn PDF document text
    • http://pojaweku.pbworks.com/f/speed_time_graph_worksheet.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144571959/85676369709.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/f/super_smash_bros_arms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4ceb95-f5a2-42cd-bc9c-8aa25d5153ce/67315785703.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413526/fokolodinurakasitezo.pdfIn PDF document text
    • http://mavawakuto.pbworks.com/w/file/fetch/144885957/74775559867.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/history_of_russia_1860_to_1945_in_hindi.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144427233/apex_legends_aimbot_ps4_download.pdfIn PDF document text
    • http://lifevuve.pbworks.com/w/file/fetch/144667620/73777578354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2097bab-71bd-4394-9f4f-639036c8d014/43111554649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d3e2e2-e62a-40e8-99a8-086cc20eb707/toro_gas_snow_blowers_with_electric_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584cee32-50a4-4aa9-830f-e90af6a010ec/what_is_the_purpose_of_improving_your_business_writing_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338a451e-4115-41d2-bb71-f678dd2713c8/toshiba_-_dvd_player_vcr_model_sd-v296.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/how_much_does_carvel_ice_cream_cake_cost.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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 5408 bytes
SHA-256: aa9ba31701b1c9cb8fbb5fac1781024a689513e40cd43582655ade8220706436
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10512 bytes
SHA-256: 4d9365bdcb3ef1ed76b8d52b7afe0cbfdf35315da324fa8a922376d9e9a58be1

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