Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6c0b6ed666be81…

MALICIOUS

PDF

79.8 KB Created: 2021-05-10 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 378b573b426dc6197799d85924a92941 SHA-1: 085fc0de5cb46186fef8c094f4d5c6a1ae79a6ea SHA-256: 9f6c0b6ed666be81c337ee79a20e019ddd1d134873b6e474d7ce33853ab8b652
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site.

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://gimoguvi.ru/strik?utm_term=senior+citizen+discount+booklet PDF link annotation
    • http://zifixoribe.scienceontheweb.net/qualities_of_a_good_teacher_download.pdfIn PDF document text
    • http://umdtheatre.ru/vulewifukasunevinujil85k.pdfIn PDF document text
    • http://teachersaid.fun/86080045387n1vie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_6040ae8090ba7.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/ct_scan_brain_tumor.pdfIn PDF document text
    • http://reduslim-italy.site/how_can_i_apply_for_ross_online1xlwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_606e95f88eda5.pdfIn PDF document text
    • http://azorocheat5.xyz/pdf_to_word_document_file_converter7prfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_604d1b7b7219f.pdfIn PDF document text
    • http://jewlgems.com/trial_of_grasses_orderl3yp3.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/principle_of_centrifugal_pump.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/cff9d66f-14e8-43f0-aa93-0bb3404358e0/70515301367.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/myanmar_ethnic_conflict.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/revue_d_assyriologie_et_d_archologie_orientale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96de52ed-7619-4d6c-9838-c085755adccb/this_book_loves_you_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6255cb0-168a-40a0-b79f-45d702b66876/mcdougal_littell_algebra_2_textbook_answers.pdfIn PDF document text
    • http://degevojorak.myartsonline.com/chinmaya_mission_bhagavad_gita_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1ad6ae-9635-48a0-a5b3-8bc16792bfa2/44489305266.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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 5080 bytes
SHA-256: 1c7cded3d77adff9827dfca06621ebf6609697644c8c41576fdbade866f5bc49
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 11088 bytes
SHA-256: d6c06adfac0ec0183f50234828a845fcf74734c1fd3b8a5d8c954735362c1537

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