Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a679f0c169b1abe…

MALICIOUS

PDF

58.2 KB Created: 2020-12-16 23:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132b72beb2b0036f18d1e09fa671e3e5 SHA-1: cf16fe5e18f4f9f4ae7458c25d378cfaa861027a SHA-256: 4a679f0c169b1abe15bea3b0e95aa6c87c2d48a7145738bd8ac584eb5942ef91
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/strik?utm_term=large+rabbit+hutch+for+multiple+rabbits
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/baputedev.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/0d9ab.pdf
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fadfed22e29f.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fad1372615fa.pdf
    • https://rajutusila.weebly.com/uploads/1/3/4/6/134666313/fuwuwiwus.pdf
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/doleruzoxifex.pdf
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5f9fb4c66c1dc.pdf
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f8d7cc0ad0b7.pdf
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/9255559.pdf
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/8136383.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/redegelesibif/cessna_caravan_manual_portugues.pdf
    • https://s3.amazonaws.com/fifomi/the_case_for_faith_lee_strobel.pdf
    • https://s3.amazonaws.com/bojafazes/vepisozezis.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca48.bin
a020cb9c072294166ddb2d4f2ac26ae87262a8fe327fe62051a56097f91c4d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 5284 bytes

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