Malicious PDF — malware analysis report

Static analysis result for SHA-256 397cd0e3d9615784…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 08:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fe5c058ab6f1dcd5068d540d9e8733a4 SHA-1: 2f3a8d2aa9d65ffa159dec2cb3d88a213a0c3a83 SHA-256: 397cd0e3d9615784e73156153aa63f1c068ebd7504037e02e04cc72a58a90c62
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 PDF files, suggesting a link farm or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+to+learn+advanced+excel+online PDF link annotation
    • http://yatvoyya.fun/kufetelukukabifujelazelunxey5v.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/fatol_tomoliju.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/resumen_del_capitulo_2_de_la_obra_un_grito_desesperado.pdfIn PDF document text
    • http://ewop.space/12_marksheet_downloadiw8mi.pdfIn PDF document text
    • http://watertea.space/xenavetebuselowujonisetandkvox.pdfIn PDF document text
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/ribinin.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/firidewuxefezutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovuzize/roxenefadafimexuzamid.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/anatomie_de_l_abdomen.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_a91c5c10cb994f5ca1d3beed77d2c8b3.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_4922179746354535bfd3e36630d2c9e9.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_a24281fc69234785bb4bf22a63348e4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/how_to_update_hds_gen_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/fogsi_guidelines_for_induction_of_labour.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/cuphead_theme_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b74d08-6f3b-48ec-8002-c416e79e8a7c/does_ahsoka_tano_come_back_in_clone_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25df1629-b2de-447d-86aa-483a0cf62ca9/69240648999.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_af2d9a16dc74491ca9c4ef6f2e6ef620.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/what_is_object_oriented_programming_simple_explanation.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_db23c9e134a248be858461577e55148f.pdf?index=trueIn 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_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 4936 bytes
SHA-256: e37f531d9dad4f38eae3b8900474cdd7d69a1f83360dc3210770e94b9edda2eb
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 11300 bytes
SHA-256: 07351774019d5a53b838b0cbe1c09e3bddc1de6551a10d8d67aa7847d4ffd06d

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