Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f31545d6a1d79d…

MALICIOUS

PDF

78.2 KB Created: 2021-06-10 01:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f569ff573bcf22068cdffbae8cfd34 SHA-1: e39f6b92e53a55505e0007470755fabcc1644f59 SHA-256: 94f31545d6a1d79d1cdd25dbc867b269cc05a8b672834197700128085e8b2287
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a domain associated with potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=new+football+games+2018+android
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/gibek_tikadegit.pdf
    • https://mijekonepe.weebly.com/uploads/1/3/2/8/132815105/83799.pdf
    • https://static.s123-cdn-static.com/uploads/4402721/normal_5fe4671f42fd3.pdf
    • https://static.s123-cdn-static-d.com/uploads/4458840/normal_60b4cb52af0ff.pdf
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/zotefutu.pdf
    • https://cdn-cms.f-static.net/uploads/4417315/normal_600d56c80a64d.pdf
    • https://static.s123-cdn-static.com/uploads/4449004/normal_5ff9099294890.pdf
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fc6f225a3741.pdf
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60223f0457305.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_603a70e93e83a.pdf
    • https://static.s123-cdn-static.com/uploads/4472775/normal_6002980a43bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4464871/normal_60469052c8f81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/385e3b56-e39f-419e-85bc-26f6a53e0bb3/78492334349.pdf
    • https://uploads.strikinglycdn.com/files/cefb09ab-41d4-4f87-acec-97dc537a55db/nelavogozabakaninikolo.pdf
    • https://uploads.strikinglycdn.com/files/f81f91ab-b340-4dc8-a2f5-b4fc3afe2642/what_are_the_income_limits_for_michigan_medicaid.pdf
    • https://uploads.strikinglycdn.com/files/07765878-e0cd-454b-94eb-a39a9e2080a5/generac_22kw_installation_guide.pdf
    • https://uploads.strikinglycdn.com/files/42af2e92-51f9-4a1f-bf7f-a21b6e1202c9/what_are_the_greek_gods_animal_symbols.pdf
    • https://uploads.strikinglycdn.com/files/c2b0078a-803e-4cc8-9afb-dbf4c3a094d3/neraveluxaxefudopanef.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_off0000f344.bin
91da3178c2dc7a50df87b518150ac261df6b4f27c465e14163dbdcd6b7bd7a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5948 bytes
font_01_sfnt_off00010787.bin
3b69a7c94ea3b73f6a5a5114cd4dd506eebac943971cb2cc3f178ec5b4410f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 10624 bytes

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