Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da5a70594507cb…

MALICIOUS

PDF

34.1 KB Created: 2020-11-08 15:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43584e04b286bbbd032453ef2a1b0da0 SHA-1: 1f4293eb2f3b5965fe59876ba55bd4c862676b85 SHA-256: 85da5a70594507cb16fafec11b50603491590e7283e13435bb4e434eb48eb263
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The document body, though partially corrupted, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or redirection scheme.

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=harley+sportster+repair+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fa645f202839.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fa23c57eceda.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f90b5cf56a55.pdf
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f971f86551a0.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/f4cb909e3d.pdf
    • https://xupuxagezizese.weebly.com/uploads/1/3/4/6/134613092/nofiginobutinu_mugax_tikoxafugorolos.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f87350a4005d.pdf
    • https://cdn-cms.f-static.net/uploads/4392215/normal_5fa7bb07af306.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/pezeferoxesizo.pdf
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa183f4a246c.pdf
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5f91a9675e790.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xixojis.files.wordpress.com/2020/11/exemple_de_dissertation_juridique_en.pdf
    • https://uploads.strikinglycdn.com/files/fcbdcd45-1d54-4af4-b3c8-724d1bb9c483/duvetubefuwa.pdf
    • https://uploads.strikinglycdn.com/files/923f2813-9794-4e39-abb4-81c6413f04ee/6516477446.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004807.bin
21a6e5a3232a3196e1bf2aa26e3ee9ba02e7b8724ec8f17c2e469aeae40dfa44
pdf-font-stream PDF embedded font (sfnt) at offset 0x4807 5248 bytes
font_01_sfnt_off000059d2.bin
507d3db73a9279e5b3482f92cbc865b1d3c6d748e8f0f7b89e2c17181a54a4a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D2 9848 bytes