Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e9fc589ea050f8…

MALICIOUS

PDF

83.0 KB Created: 2021-02-20 04:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72a71869c4c406bf75757df4d8c04877 SHA-1: 8de34c2aaae6f491f408b36884f0363dc7a0e827 SHA-256: 15e9fc589ea050f84360d9c1b8ba367d7412dda59128bbac0e5770267921773f
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily garbled, contains a title that appears to be a lure for SEO or phishing purposes. No scripts were extracted, but the PDF structure and numerous external URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://jottigo.ru/strik?utm_term=como+obtienen+energ%25C3%25ADa+los+seres+vivos PDF link annotation
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/nunovapoxasosuvawet.pdfIn PDF document text
    • http://goproonly.com/79509617583yp2ha.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/3b98f58432c.pdfIn PDF document text
    • http://twirlini.com/basikovobabekuxebogog2q3f0.pdfIn PDF document text
    • http://glawerry.online/gikirirakanavapamij3l21v.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/1388871.pdfIn PDF document text
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/e3a2b84.pdfIn PDF document text
    • http://micrometerdigital.xyz/ladofemubagizepalojiguwuyadfy.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/bb72d4.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/7bd858ab532.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/jovaludisafajitugiwa.pdfIn PDF document text
    • https://zaridonuxubotu.weebly.com/uploads/1/3/0/7/130775126/palamitomeji.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/860fc0644160.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/vujokatodudin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigukesege.epizy.com/92431790151.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_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 5164 bytes
SHA-256: adccb74bd64e0b00f78800d2f974335aab7382e809e8b606330768d4eafd3452
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 11424 bytes
SHA-256: 65cb24e73b57531420a0641bc496c136b29c188d7e781041c5813ffac4d227f8

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