Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdd017f99bb3873…

MALICIOUS

PDF

75.6 KB Created: 2021-03-09 02:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 667f5b1c7dd3e2dc0d5e77e0b8ff7c49 SHA-1: d30459349b524d8630221d61cd9a996bfdfda85d SHA-256: efdd017f99bb38735d364fe1a1492228ae48c43d6e18f6db05fe80a40850cab9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=cours+astronomie+debutant+pdf
    • http://pakirekugep.scienceontheweb.net/libro_de_urantia_wikipedia.pdf
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/lugebemosasa-zokor.pdf
    • http://falorilipeb.mywebcommunity.org/vodegakidema.pdf
    • http://baliferifopiz.mypressonline.com/vimujirolajopovobopefovu.pdf
    • http://lirifajo.sportsontheweb.net/gazeporasetibutimibafej.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/146077.pdf
    • http://woxuruko.medianewsonline.com/jude_the_obscure_full_movie.pdf
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/55d7adb9d4bf.pdf
    • http://suziterunedoloj.sportsontheweb.net/wavamajapati.pdf
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/sojibiwekovaler-kegawilugivigu-xijuwuge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_25632de915124ca1922223974f6b2c3b.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_05f06a1661c941f5a121445e7e923546.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_505c1be5adac4e66a5c68b9d72d544c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52813b1c-724f-4a64-8a56-152b59ba869d/area_and_perimeter_formula_for_different_shapes.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a124952eba564b0dace4ca60dc893706.pdf?index=true
    • https://uploads.strikinglycdn.com/files/356cd8a4-25cb-4071-aadc-00375fa9d01a/rizulukedore.pdf
    • https://uploads.strikinglycdn.com/files/150433bc-b9bf-4994-b878-471cf59f00d0/que_significa_soar_q_se_te_caen_los_dientes_en_pedazos.pdf
    • http://xemunebo.atwebpages.com/ny_cdl_passenger_endorsement_practice_test.pdf
    • http://seroroxunabolu.onlinewebshop.net/tedarafobagulano.pdf
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_f6bbb19145974eb49ad9d695235a1455.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ca8f8be9-783c-49c1-a1d6-fe6fa54f3b41/how_to_delete_facebook_account_2020_youtube.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f9.bin
ad63d788becece8ec0c15455f3b652cc36c219e6654bb7cf02fc38daca7a93c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5200 bytes
font_01_sfnt_off0000f883.bin
4810724503ae6d149be89e3e4ebd05cad97500ae5a7f023972439a2f556dc317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 12460 bytes

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