Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20f51e24ae310d5…

MALICIOUS

PDF

44.9 KB Created: 2020-11-07 11:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ab794f1bcba633da8423a953f97fa53a SHA-1: 10111ca9a42e9b10a508b047a9b2267506839d53 SHA-256: d20f51e24ae310d55f8731e7bb04f1c0669a6e09d9e4c5c179f370f378d1d427
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 1.0000

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?keyword=gymboree+class+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8718ac70953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f9bab4b28168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f926f68450db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f9e393933bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f912b1dabdfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fa4efee24b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8b53a1aefee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_5f99f94fe047b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fa483203b5ba.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/bikikanafopavu/rewetagimesev.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/41878371815.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/33528718984.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 5452 bytes
SHA-256: 686e6dd84fdd8ca874f52b8d574688702d639291931201d76a63b291e4fe39ba
font_01_sfnt_off000080d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D9 11036 bytes
SHA-256: a6d6077c78a6ff352f63e8fcdfcc6f861e1ff9b82779befb3b1483e7361121d5