Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a30e3bce7fe0cc…

MALICIOUS

PDF

70.3 KB Created: 2021-03-19 20:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e97094ed116cc0152dcd1b8068bd6c SHA-1: eec78cca23e64c7a0c10c32fc2424fc8f41ba6d5 SHA-256: f4a30e3bce7fe0cca069671af1c510f24f0fc1ab0e18ed73d0aeca859f91b855
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://pelibifir.ru/aws?utm_term=how+to+put+a+belt+on+a+hoover+rewind
    • https://jowizixevudaw.weebly.com/uploads/1/3/4/4/134489406/monotodesusugafula.pdf
    • https://cdn-cms.f-static.net/uploads/4418796/normal_604157637dc5e.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/87d35daf.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5fd1109ed8a79.pdf
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5fd11c348ebf6.pdf
    • https://tedofejufada.weebly.com/uploads/1/3/0/7/130775935/vekisasimuf-tifefegok-kivimivelo.pdf
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/jugur.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd267502ba9f.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_601d8b946b1e2.pdf
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fdca76e96741.pdf
    • https://xudarusutovupaf.weebly.com/uploads/1/3/0/8/130814591/7936938.pdf
    • https://cdn-cms.f-static.net/uploads/4481836/normal_6053132ba66b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wukara/voxodexurejaputip.pdf
    • http://putijanonodeda.rf.gd/partners_group_infrastructure.pdf
    • http://renureva.epizy.com/guide_to_iceland_map.pdf
    • https://s3.amazonaws.com/jivagajamav/ecg_interpretation_with_answers.pdf
    • https://s3.amazonaws.com/tokatefozude/wugixubarufavazovakalagi.pdf
    • https://s3.amazonaws.com/tojazudibumogab/54320866502.pdf
    • https://s3.amazonaws.com/vebenok/samsung_q7f_75.pdf
    • http://vodividubo.rf.gd/kezofumerubaseg.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/a_d_m_o_full_form.pdf
    • https://s3.amazonaws.com/gidibesuxi/53785073389.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_off0000d7eb.bin
0c8a50ed6716125939548d410872b54a51f395be988343806b79a685db9343a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 5120 bytes
font_01_sfnt_off0000e95b.bin
dc5d6bab73a4795ee2caf9a172bf2696b4ad19c3c3a12ac8fa8f8e03ae0e4489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10080 bytes

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