Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01f8e7a2c2107ed…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 10:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1404a0fb72af128cd7a63a950f2d2abf SHA-1: 8d832666dfcdced12b94af5e092521fbc48a1798 SHA-256: a01f8e7a2c2107ed77fe43fc75bfb9d820842435223020d56fdec8e1fa49c622
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic firing. The primary URL found is https://gimoguvi.ru/strik?utm_term=united+states+army+rangers+ww2, which is likely part of a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/strik?utm_term=united+states+army+rangers+ww2 PDF link annotation
    • http://zawopim.mygamesonline.org/analise_combinatoria_projeto_medicina.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/Eihhvie/vareguxexilenebafisipep.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/black_and_decker_jigsaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_6061ad55cccea.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/emjcdpO/pumanorokijubojuz.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hhePNPr/dog_simulator_puppy_craft_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/bodosuruwalu/m7mwvUk/java_jdk_7_for_aix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_601bf96a74602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60140318461f7.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/gjggiXI/39510142863.pdfIn PDF document text
    • http://desokore.medianewsonline.com/possessive_pronouns_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xalasawu/73064917789.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_3a304387d71a4a7988e1e4506faa009a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ratixifo/instagram_videos_free_for_whatsapp_status.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_30f7f1166e24481ab21de4f4c4a85780.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/72983579355.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_fa52ba948b4c4f88b2db6bdc02b17f69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/hdfc_mutual_fund_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/22253844164.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/gutizurikadugogoxevas.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/samsung_xpress_c460w_toner_compatible.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/ronco_food_dehydrator_vent_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/22457418382.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/80_cotton_20_polyester_bed_sheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 5108 bytes
SHA-256: 15494d5106f2b72d7040689e738f4897e08d0f0c014ac3e84c38016015411457
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10696 bytes
SHA-256: 08ccd670af42b16344f38c7664e417b28922ddecf9e71eb22417e27dce80cfa3
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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