Malicious PDF — malware analysis report

Static analysis result for SHA-256 8830d7ecd5cd8e52…

MALICIOUS

PDF

41.9 KB Created: 2020-11-07 21:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e47a3e445e54ee2c66110ad71f33b6fe SHA-1: 30b4c8c2ecede9286dac5b86b1fce5ddf83ddd95 SHA-256: 8830d7ecd5cd8e52d2fde4f0829e5a685414e34d1015c180d01f1e0c72d48527
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document exhibits social engineering tactics, specifically a 'ClickFix' lure, by presenting a fake error message and instructing the user to copy and paste commands into a shell. This is supported by heuristics indicating a clipboard command lure and a general ML classification of maliciousness. The document also contains numerous external links, including one to a potential link farm, and an embedded URL that appears to be part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=error+status+0xc000012f+fix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9bdc5f5c268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5fa622a932536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fa3daff93ddb.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/vopenofitavesepivos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_5fa5677d75d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f87567315f61.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/nosifitenenuxadubib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zudotel.files.wordpress.com/2020/11/dugodimit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e5fffe-df29-498d-9674-74e32142c3c1/32813625195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f71aa84-84a6-4065-b644-98360a6097e6/46986622386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18a8571-f684-4b38-a99c-2848ebeea1a4/que_capacidades_fisicas_requiere_el_aprendizaje_de_la_natacion.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://pidenus.files.wordpress.com/2020/11/schwinn_203_recumbent_bike_manual.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_off0000643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5192 bytes
SHA-256: e233dff7b04c9818370753ef0d6b97b39e3cffb53c6ec070f9b413f210574129
font_01_sfnt_off000075ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 11004 bytes
SHA-256: 690752b883d0e60fbfc1a4c4b4b60fab7af3c10e89b0e6853d03f5d4ed16e471

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