Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9438c66c13cec64…

MALICIOUS

PDF

80.8 KB Created: 2021-04-14 00:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a59fff12a433d5215e0cbe5b472a5082 SHA-1: 7b2c48e10bb87b0f61225021e913b84233ad162f SHA-256: e9438c66c13cec645fb7176e5e0350df3f9dc0f072ac24e0fbb347d70cf12930
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=the+ruins+of+gorlan+pages PDF link annotation
    • http://timurberg.ru/gexagomunaxepowgbjcb.pdfIn PDF document text
    • http://wow50.pro/honeywell_1300g-2usb_barcode_scanner_manualern7l.pdfIn PDF document text
    • http://koreanluxe.com/why_do_atoms_join_together_in_a_compoundsv2rs.pdfIn PDF document text
    • http://naturwows.space/771767237064etxs.pdfIn PDF document text
    • http://trellos.fun/culturally_responsive_teaching_and_ti7nl8.pdfIn PDF document text
    • https://cdn.sqhk.co/piwoputi/Amtkdij/lofesazidomul.pdfIn PDF document text
    • http://neo-tp.ru/luwipurezupominekeke3j0pm.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/Y4vIjam/87085993992.pdfIn PDF document text
    • http://tazibadubikatim.iblogger.org/balance_sheet_format.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/ronco_dehydrator_instruction_bookletf6rfg.pdfIn PDF document text
    • http://dihtyar.online/what_is_the_most_stupidest_animal_in_the_worldb5zkl.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/bTmijib/what_does_effective_guided_reading_look_like.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_ae47a47060454c8e9d76bd93a494a8bd.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_0787958f08084a0cba221e6753668fb9.pdf?index=trueIn PDF document text
    • http://gaxekexo.rf.gd/l_blends_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d90881f-9c7b-49f3-9a67-f003a63cd77e/how_to_know_if_a_redox_reaction_is_spontaneous.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_19c56617d9ff4c15b34b1acb9bd6bc1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f969a625-baee-428f-8e1c-e36fc4f2bb58/tefal_pressure_cooker_recipes.pdfIn PDF document text
    • http://parimafilifupev.rf.gd/charitable_giving_report_2018.pdfIn PDF document text
    • http://fesejawezu.rf.gd/risperidone_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba356a1-de2e-450d-9f0f-b9cc9b5d370f/35473684348.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_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 5112 bytes
SHA-256: 353b81f05ebfba484e7ceb40279e205126699143170ae9361138d45a63213f34
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 10424 bytes
SHA-256: cbd78b9fa13b55c9dbfd5b78103d181af75451ca65b07a210ec047b6d87ee534

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