Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bcd81e9f5306e5…

MALICIOUS

PDF

82.3 KB Created: 2021-02-25 07:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 02a12206e412a1f6478a696f04567e44 SHA-1: 78994f6389cfaaace103d1cfb8d74759bd7ecbbb SHA-256: 06bcd81e9f5306e5fa495de6c903f9bd733850e1ddcf0782853d02e58c18e0e9
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which, 'https://yafferge.ru/123?utm_term=la+celestina+descripcion+del+personaje', is identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'La Celestina'. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=la+celestina+descripcion+del+personaje In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_600f1efa785ac.pdfIn PDF document text
    • http://podarokinsta.online/pegopulofekewudzjics.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/textbook_structural_analysis_and_synthesis8245y.pdfIn PDF document text
    • http://uablog.website/how_to_bypass_john_deere_reverse_switchrcpuz.pdfIn PDF document text
    • http://tevojagi.iblogger.org/itunes_mi_nht_tieng_viet.pdfIn PDF document text
    • http://steblin.pro/homeschooling_pandemic_pods1jirs.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wixubabatoxijor.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/vibuvomomuv/junekefovunokaju.pdfIn PDF document text
    • http://romotugujelit.rf.gd/17875668536.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_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 5084 bytes
SHA-256: 3219234daa93197d3d3dc54de78060bef5d9b1d01fd4df2366655961818ed032
font_01_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 12576 bytes
SHA-256: b148c643c69aa43f2c4a7cedeb46d2879348635b06414dfeb8202c89c8f4387b

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