Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76f097d965abc53…

MALICIOUS

PDF

59.5 KB Created: 2020-11-09 09:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1be09f481abd6fd70cd3959891d1487 SHA-1: 134fff5861ae8113fa6302b8f1d31db02094182a SHA-256: a76f097d965abc53685c8891ba528932cb21020466d6f705664b79ff316be603
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL identified. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains text related to 'ancient china civilization facts' and the suspicious URL, suggesting a lure. The presence of multiple external links, including one flagged as suspicious, points towards a link farm or SEO manipulation tactic to drive traffic to malicious sites.

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://trafficel.ru/123?keyword=ancient+china+civilization+facts
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fa5e03498980.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fa0ebf70d7d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/35499081-5541-4dcb-8e2d-16cb11c0a2ca/resmed_s9_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/30aa7155-2798-474f-a4aa-b6ab3e62a500/37348571392.pdf
    • https://s3.amazonaws.com/xebareto/16887027068.pdf
    • https://s3.amazonaws.com/petikamov/pdf_keller_marketing_management.pdf
    • https://uploads.strikinglycdn.com/files/99ae2203-a5c7-46f7-af1b-ffc016a1196b/notojuzatab.pdf
    • https://s3.amazonaws.com/kizugokofo/john_horn_high_school_staff.pdf
    • https://bekovepevim.files.wordpress.com/2020/11/leniwibewuwiweki.pdf
    • https://uploads.strikinglycdn.com/files/ed68f5af-70a7-44b0-89a3-c7f0e07db1ee/intermediate_algebra_alan_s_tussy_5th_edition.pdf
    • https://s3.amazonaws.com/purufiz/sabiva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007505.bin
5b09dd4e83240da9d220e18cc85a6ac1ecf94383a5f207f8e6d4bf59a52a66be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7505 12336 bytes
font_01_sfnt_off00009ccb.bin
8bc71bb70543087edf2e3b0be0899bd7a6646747f54fd4147f8e5694c55d75c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCB 4760 bytes
font_02_sfnt_off0000acf6.bin
376463b20091d4e8930bc9ef03d08ce8df3632e728441d62ac8c556114ac9738
pdf-font-stream PDF embedded font (sfnt) at offset 0xACF6 10472 bytes
font_03_sfnt_off0000d0d7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 4324 bytes