Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed89f25d567a1079…

MALICIOUS

PDF

78.6 KB Created: 2021-05-09 08:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93ba13d6b4f05a126bf5718af314c8b SHA-1: 5bdf044a664b7783253ab1ecc8fec69e85deb623 SHA-256: ed89f25d567a107932658e3ff839f1acd71b88391bd49146c514ec5254c5a6a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content hosted on external domains.

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://botokaw.ru/strik?utm_term=public+relations+online+courses+uk
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/1e47136.pdf
    • https://pifikarudeb.weebly.com/uploads/1/3/4/3/134330951/9479352.pdf
    • https://rimapanexap.weebly.com/uploads/1/3/4/1/134108998/504504.pdf
    • http://penafur.scienceontheweb.net/gazivo.pdf
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/804a68ad5ed2.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/detajiweg.pdf
    • https://cdn.sqhk.co/rivogigaweb/mjhyjeo/mobituwoba.pdf
    • http://zofunubesosena.mypressonline.com/56502537263.pdf
    • https://cdn.sqhk.co/xanikadir/ihiegeV/ammunition_manufacturers_in_missouri.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6037e11bd84c4.pdf
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/xaxopu.pdf
    • http://boforotaje.mywebcommunity.org/scavenging_in_2_stroke_engine.pdf
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/404897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_436ce206a4a94b039bc019393c5539f9.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_d38e5e9214934568a2a91bbf80f51a7e.pdf?index=true
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_eabe84a6df1244f3ba32ff7a8c3d29f0.pdf?index=true
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_32a427d2b2ba408c94691e71905595cd.pdf?index=true
    • 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_off0000f4aa.bin
ad17e62b5c3200dd2e7e0acab05340418d0ff1e7ba1aeb9e5d3adb29f64cd8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 4996 bytes
font_01_sfnt_off000105b4.bin
0882c324767a0cd424b155fe386e50c320aeab51dc054cc6e713b8f0e7ade14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 11908 bytes

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