Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71c44a9e092dab3…

MALICIOUS

PDF

82.7 KB Created: 2020-11-08 02:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b22eb1c857ad08e007b97ea1b5bb6b86 SHA-1: 90582701d2f4208f958e9545de0f01b184c06de6 SHA-256: b71c44a9e092dab33409fbe122e8f1cc5e1631c567c2b5ffc8d5306e1657ee05
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://trafffi.ru/aws?keyword=mustapha+mond+in+brave+new+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5f9fbd8eeb64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5fa19bfb2a860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f97be404dd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5f9d2cce034c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fa30a6ebd40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f9811d7b2a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_5fa195271642c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f98eb0ccfc22.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/jususuvinoguxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5f94bf5e97285.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/pewibim/lopasegesosifewexi.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/dlc_characters_for_borderlands_3.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/camino_middle_school_las_cruces_nm.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/bopowukixulufifufiko.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_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 5496 bytes
SHA-256: cb8f7394db49ea0b9825806fbf3d473d580126d1978267c2ef38b399df097be4
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 12480 bytes
SHA-256: 61cc9eb69ef3544dc59b3f4ea50449061780650196decd42a43c4f06e6d32660