Malicious PDF — malware analysis report

Static analysis result for SHA-256 80545383cd973506…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 06:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e931790a4124b98596907822771b4d24 SHA-1: 590bdaa713fb93faffa2fe5055881852cd1a3139 SHA-256: 80545383cd9735066420faa6d9a38c48a12dd340620f4c1cbbd7280fec1426d6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure itself facilitated the malicious URI embedding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/123?utm_term=how+do+clipper+guard+sizes+work PDF link annotation
    • https://cdn.sqhk.co/tizuvuwo/jgiibaU/38044636419.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/76252615958.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/jfNghjf/flow_free_bridges_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/iiEdD5O/twisted_tea_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/dxHBgf0/snapchat_icon_blue_neon.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/aspiracion_de_secreciones_bronquiales_procedimiento.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/canon_speedlite_430ex_iii-rt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_602b42a657fed.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/46835498477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fed7b9d30fcb.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/njeiP9J/93140650894.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/13268999057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5fe01e38de19b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukut/85273762566.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/impact_of_globalisation_on_indian_society.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/97449737305.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/momitawub.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/admanager_plus_update.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/gantt_chart_template_spreadsheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5408 bytes
SHA-256: e314ffb427c53ed02c7d600b7d47bf682474228d6cac292924851b426d182733
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 10716 bytes
SHA-256: 5fa86fd9f8e1de13c959f77196c0e480eaac6d37666c006aace0cd2a2742df3a

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