Malicious PDF — malware analysis report

Static analysis result for SHA-256 693091d89d3b54f0…

MALICIOUS

PDF

129.0 KB Created: 2021-06-01 00:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe6e9f7a51a1a2e42461b29770a557b4 SHA-1: f8b3b88e909d28ab0513f720316f77e302df3de9 SHA-256: 693091d89d3b54f0aa826eef3f9f7288f30353bcbd78ca23e1d82cd1f4cdafe5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://jumiwimov.ru/123?utm_term=infarctus+du+myocarde+symptomes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387590/normal_602b72ae7746c.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/nidupurugepu_xajapufan.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/medik.pdfIn PDF document text
    • https://ninibukakogim.weebly.com/uploads/1/3/2/8/132815385/bivudijinuromirat.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/guwamelasubi-gasasizug-dekezumise-larijemodas.pdfIn PDF document text
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/wuxojigemelotif.pdfIn PDF document text
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/0de03ca70.pdfIn PDF document text
    • https://velulaganivuvoj.weebly.com/uploads/1/3/4/4/134438708/65dfbfd3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_6000bfaac754b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_605456cadc9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_6009f91b0f3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_5ff4271761403.pdfIn PDF document text
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/419352.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/cd9f49a3-77fc-41f8-b8a5-e42050b3246f/sap_fico_tcodes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bebde5b-37d4-4f6e-9d95-dd3f92d7eb9c/13104844950.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144428568/movimiento_rectilineo_uniforme_acelerado_ejemplos_de_mrua_en_la_vida_cotidiana.pdfIn PDF document text
    • http://garigor.pbworks.com/f/nifisiwu.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/the_21_day_sugar_detox_yes_no_list.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/67459397062.pdfIn PDF document text
    • http://garigor.pbworks.com/f/grams_to_kg_worksheet.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421746/51974080943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f605b5-1990-4c22-9e14-7d26daf26a57/maxatoraxubunofiridis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F6 5308 bytes
SHA-256: 68440a19167397a2afd49df96605bd59fc6e7f58ac7400979deec2bbc62b87e0
font_01_sfnt_off0001b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5FD 13000 bytes
SHA-256: 47747a540f2852a91939160b969f251cd72b2421c6d50ef14fd772b70921f735
font_02_sfnt_off0001de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE92 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf