Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb8ce22887641b…

MALICIOUS

PDF

34.3 KB Created: 2020-11-05 19:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1c6fc0d64d7fc860c1270fa362a1e06 SHA-1: d8172908a189bed623523677eac9d40fb435d67a SHA-256: b5fb8ce22887641bef5a88bc4f3532bee3fa1d11262b24ea9bc1f55128dfe37d
96 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. 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 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://traffnew.ru/123?keyword=royal+high+school+in+roblox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f9ac5287ee2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8e7e62b1d75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/df6978f3-9699-444c-be15-db178da83626/77389291513.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/sandisk_sansa_clip_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4391022-09d0-4eea-bf30-0d382b969c9b/sefavofidewuduxixaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2c1b79-83f9-4938-b454-26f5d8397594/sexadaxezekem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1150/4789/files/86719435908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/gegatopaten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038c01b4-d2d1-4465-b3ac-686ed6dfb4f6/36383995432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853cb03c-b6b6-4199-ab6a-8e54d6b54cbd/73554665542.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DCA 4968 bytes
SHA-256: 5ca812688f557d820bc4e1af4f90305873fcfc7efaf438a6c26a17c9697bffd7
font_01_sfnt_off00004e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E99 9372 bytes
SHA-256: 1603d59001ba61216beaf3cb752048ede183301ace41050d9b2e3cc0614d725a
font_02_sfnt_off00006ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c