Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a5c421c2116e1a…

MALICIOUS

PDF

79.7 KB Created: 2021-05-08 05:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b922061c2cc4d4cc6833fe61f12aeb84 SHA-1: e81e6119fdbfb1a9d56f48f687dac496ee3f9b6a SHA-256: 83a5c421c2116e1ad402daaad3e447ad2cce80d72be5207d2aea860428bd2ace
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. The document contains a large number of external links, with one prominent link pointing to 'https://vilenefex.ru/strik'. While no scripts were extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to potentially malicious websites, possibly for phishing or to host further malicious 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-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
  • 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://vilenefex.ru/strik?utm_term=why+is+grammar+important+in+business+writing
    • https://cdn.sqhk.co/jatizaru/ejehdhg/gedetapexetel.pdf
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/498843.pdf
    • https://cdn.sqhk.co/xalazuwumi/fYtFoie/midas_m32_digital_console_manual.pdf
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/nuzos.pdf
    • http://jenuxijaf.mygamesonline.org/skripsi_budaya_jawa.pdf
    • https://cdn.sqhk.co/diratukuz/D5jbLyT/michigan_archery_tournaments_2020.pdf
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/1664653.pdf
    • http://kisuvok.scienceontheweb.net/entrepreneurship_development_course_material.pdf
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/6663904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_fc1b8f32941b4dcaac74ce8fc1916cd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5f68ad5-e12e-4455-bc9b-f677b13eb497/sowonafivateleduzif.pdf
    • https://s3.amazonaws.com/mozedijiz/gosegove.pdf
    • https://s3.amazonaws.com/fikuvine/79531735000.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_865ea177df5e4183a21df097d2089146.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb2c9b0a-5c18-4d83-b4c5-d5b858090b5b/vegewenawotolenak.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_84b0a025ed2346b9b46e2d1a6042f5de.pdf?index=true
    • https://s3.amazonaws.com/wujixus/installer_android_studio_sous_ubuntu_18._04.pdf
    • https://s3.amazonaws.com/pesetufavo/76286726014.pdf
    • https://s3.amazonaws.com/kijelopazekune/31543181969.pdf
    • https://uploads.strikinglycdn.com/files/8ceb7a41-ecda-4161-9473-8320e641b0b4/suxubigowej.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_f69c8779e4e145bf9b6eabf09a60ac0d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin
d72db9634cdcf0cde58903b7cd28088136b6f05b53b4a5f4947e22d439013aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 5428 bytes
font_01_sfnt_off0000ffd6.bin
e2fbedb286b4f049078615a9b1e1615e0190816b9a9d1c1119e2df4f7d186177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 10324 bytes
font_02_sfnt_off0001232e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 4324 bytes

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