Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78f251daffbb232…

MALICIOUS

PDF

72.5 KB Created: 2021-03-17 01:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d04c2a8d8d61f725dd6082d2f04af1a8 SHA-1: b26afd7e8c6e26843564114f2dcf5018517003db SHA-256: e78f251daffbb232be1042263595e62e2ffd832b5892f90dee7f147fef9e73f1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://ponafet.ru/123?utm_term=chimango+de+forma+tudo+gostoso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379726/normal_60293b1fa2ccd.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/IpQUtie/bumper_cars_snowball_fighting_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jjiaieU/healthy_vegan_lunch_recipes_for_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fe3a5235a306.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/oZLapwJ/pandora_s_tower_wii.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5ff54ac7453c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_600083f1b2905.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/alZhiAk/digabox.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/ggfsKjf/48220251653.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/dagasopones/sedunetopajelo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/precalculus_textbook_answers_glencoe.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_215254252e924af3812148f9443abd6b.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_69a2e4945ed14f77803e4925b22c9b76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/lion_air_flight_610_crash_report.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_2f9c9ec028fb44409c22b57a4bc5caa5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resixexi/fresh_ham_oven_baked.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/salivedipig.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/92238279219.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/histoire_de_l_ergonomie.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/37781627066.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5192 bytes
SHA-256: 6e31a67e925a462e3bbc557befc3867d188bc2dd6bca1fc109e439188f057b12
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 11896 bytes
SHA-256: 5d8d112bd48d6ab35c5d55c159f273a913d2b106a045919c8a615b2ab49f51b4

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