Malicious PDF — malware analysis report

Static analysis result for SHA-256 b986c2b862376d98…

MALICIOUS

PDF

84.4 KB Created: 2021-03-11 00:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350090e0d335492927766a6a18414dc6 SHA-1: 42615713c96701fe36656a582d3b46eab2ffb14e SHA-256: b986c2b862376d98eae07ee77eada79885bc2dced057941b38724ea3a28e5f1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection and ML classification confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=pc+browser+software+free
    • http://pibarulajido.getenjoyment.net/english_quran_application_download.pdf
    • https://cdn-cms.f-static.net/uploads/4463543/normal_6038339f2ec10.pdf
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601a1009a8e9a.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600aeb5260a44.pdf
    • https://cdn-cms.f-static.net/uploads/4427284/normal_60484729ebbbd.pdf
    • http://visunuduxat.mypressonline.com/kofiniwepefedisapigovire.pdf
    • http://ruluzuzadol.mypressonline.com/how_to_check_hp_instant_ink_levels.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamibudasagas/91343146298.pdf
    • https://uploads.strikinglycdn.com/files/2b6bc247-418e-42e9-8c74-28c252437a87/unity_biotechnology_stock_news.pdf
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_5a9267b8e2d240079362f17c15d8ff12.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29882685-cf93-4427-ac23-f93bfb36e7be/279628503.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/genidebexapajelifibif.pdf
    • https://s3.amazonaws.com/penale/96810777362.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_0c55f64bf3294517bf73cdcb36625be9.pdf?index=true
    • https://s3.amazonaws.com/leteraxewe/gukilowuxadasefu.pdf
    • https://s3.amazonaws.com/zabevog/australian_guide_to_legal_citation_referencing_generator.pdf
    • https://uploads.strikinglycdn.com/files/0dd687f6-f105-4d25-a924-374b3c337b4b/osi_model_7_layers.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_bf0ed072174048c0bbabe2e6a1115ba5.pdf?index=true
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_fd84b8366b794dfa88e7c423daa610e6.pdf?index=true
    • https://s3.amazonaws.com/tometubufimopim/happiness_beyond_thought_ebook.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_4a8da51e5e07463fab5b0dfd4c16deef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0de2e845-e99d-4be4-8098-d1b7bedf36fb/butubiwuzoguvezaxep.pdf
    • https://s3.amazonaws.com/lorugipopuxe/biology_project_report_on_cancer.pdf
    • https://s3.amazonaws.com/petubapizo/android_10_launcher_gestures.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_off00010eca.bin
e25052af00d4822ce3255cc136318dce3528ad1b9c6a29316709d640ae229412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 5076 bytes
font_01_sfnt_off00012031.bin
5fa7e26c3cd132524d307107d7be2147ad349ed94d68c9f451a4a8c855f1cef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 10504 bytes

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