Malicious PDF — malware analysis report

Static analysis result for SHA-256 d712c0563c22c028…

MALICIOUS

PDF

76.9 KB Created: 2021-03-07 01:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 440a3f0d747f08f8d7c303a47ce51864 SHA-1: e1ff3e62b9ca0ce9b40f536c5aac291441778bf3 SHA-256: d712c0563c22c02843c6c20bf5968e24137e91d295b90eaa2a1d08ba49fd19f9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9990

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=panasonic+phone+headset+jack+size PDF link annotation
    • http://theporte.xyz/47199194366kuul7.pdfIn PDF document text
    • http://gnfcns.info/semidutonuvezokezec8hle.pdfIn PDF document text
    • http://baugroup.info/dalikakenaxafg58p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_a94a932660cd4b75b7b8fcf3d6c539ca.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_55b23a3841f144f1814f0a9870194af6.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_d170540bb713415b8688400855f0f092.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/tuzizikakanavu.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/learn_english_language_books.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_2e7925bc836e42eaaac7e04a7dc21c58.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_68d51a5b37b74aa0a75cf4348af0946a.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_7957c8dfcc12453a975cc88ec6833ddf.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_5c7feece6026451b8485ba8e93d422fd.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_69bb9695a1884ccdbaefdf37c0ce256e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/508de145-37cc-4e15-a0b6-9fadd5c67c94/bijopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3035b3-f6ff-4733-828a-c3422f42a953/vazifibog.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_3e070c2b60434f02bd41265cc1a205c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/ets2_volvo_vnl_780_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e32f5ee-9da7-4140-bd2c-983a7c656f4b/what_is_another_word_for_ordinary.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_d35343157dbe414481083ba6ba4ea993.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_99b5efad42c54d58930d78be5498a666.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_a06c460e2f3f4bb4b820c412257891c3.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_dfe46abe205b4d5cbcdcdc45bdff0c18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defipedibe/cable_management_rack_guide.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_8dea486f22a14775b8653b5c8e79ec01.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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 5224 bytes
SHA-256: 611f957e94103fe1d9f5c20c477cec14976c8c284420114196bbaf5909e907c9
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 11416 bytes
SHA-256: 53aa7969ea35fe8936fc8fd300044d73e10b8a19860a40fea7be9b8cc4c71109