Malicious PDF — malware analysis report

Static analysis result for SHA-256 13029ae30b16bf06…

MALICIOUS

PDF

51.4 KB Created: 2020-11-06 19:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56967433b6a55db7e968dba0fb116a0d SHA-1: 990acb49e26195145e863aa20073a1efe98baf35 SHA-256: 13029ae30b16bf06b5210732ee056a5f641fa6aa88441654ace1436ee1ba8bc4
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a large number of external links. The ML classifier also strongly suggests maliciousness. While no scripts were directly extracted, the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/aws?keyword=specialist+species+are PDF link annotation
    • https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/rilupuvak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fa513e04a8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fa363c1652c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f9af7e7da73f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f91199cc4219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fa4459f60645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f9c51d488fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f884e2a774db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://raxatobagato.files.wordpress.com/2020/11/dibobatamumafoxive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5943d5b5-744a-4bbc-9a01-3ec87e2d0581/phone_directory_el_paso_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/blog_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d968fc-1c1d-49e4-b50d-174640898887/hosa_dental_terminology_guidelines.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ab3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAB3B 16176 bytes
SHA-256: 87299614930016c6b750e5193b1f2f50e8ca42cd4e137237b1ba8f75e2c6403e
font_00_sfnt_off00006bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 5032 bytes
SHA-256: d84e057d4bcb4535014fd96fbfc6be92428ffabfe3d2ece183101db2d9c62dc8
font_01_sfnt_off00007d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0F 2044 bytes
SHA-256: dedd9ef44456abfe44c7d977340348cf6e06f093193479021ef22f3fda36509b
font_02_sfnt_off0000868b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868B 10648 bytes
SHA-256: da98bfa19775c2e69f713007b76e6786f50f69233aadfa924e3b95803d664398

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