Malicious PDF — malware analysis report

Static analysis result for SHA-256 378d6c5f5c72c56d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 20:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62a4ce77b383ea53056ff82478e8f14 SHA-1: d8df6954c77ba9dbf11200bfd3dbb2f1829b8ed3 SHA-256: 378d6c5f5c72c56d785dfda97db26ab08da7097abde20a2c91745c91570ae82b
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The heuristic PDF_SEO_LINK_FARM and ClamAV detection indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8277

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=descargar+biblia+de+estudio+holman+pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_6016df59b5a3b.pdf
    • http://rilotelexewobos.iblogger.org/midnight_cowboy.pdf
    • https://cdn-cms.f-static.net/uploads/4390329/normal_6026b04eddc13.pdf
    • http://yourbigdick.space/36935270367q8xgv.pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_60135a4910254.pdf
    • http://mini-cam-v2.club/gagabixa4eaop.pdf
    • https://static.s123-cdn-static.com/uploads/4445573/normal_6000ee589268f.pdf
    • http://puveduxorapuba.iblogger.org/wuxozidezijubedorivuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_2769a5a3e9c04224b1c5f68e4f50ca3e.pdf?index=true
    • https://s3.amazonaws.com/besafefaf/sylvia_day_crossfire_series_order.pdf
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_317a1d562004446480d515d915c095fb.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/casanova_hotel_apkpure.pdf
    • https://s3.amazonaws.com/jupevuxirapi/legal_action_letter_template_uk.pdf
    • https://s3.amazonaws.com/lodazojamuva/33737849614.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/tagozoguximinixo.pdf
    • http://jujovotusenugo.epizy.com/archero_apk_free_gems.pdf
    • https://s3.amazonaws.com/fibesezati/bajijebilevu.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_fb8e0f55a60b4956a6b67e57cf3a1d88.pdf?index=true
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_819caeb3545c49c18a3da4b8bc4c8ad8.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a0.bin
40fb2b5f66fc239131fcd466fc0288b1e5337b30bb68c71356e15f0c126e600d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 5708 bytes
font_01_sfnt_off00010ad5.bin
aec96eb2e5096979673cbb698b042b326be0f27a71bb06aa334c0f4805054e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 1828 bytes

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