Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c73d5a8a503135…

MALICIOUS

PDF

71.0 KB Created: 2021-01-27 12:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 388b5d97cb2214cd81a5f12f4c1d8673 SHA-1: 620a18c7d718646191e44679bd9b5f169acd2dfa SHA-256: 19c73d5a8a5031352b86d68beddca2fbb6290f860f89164fdccfa9df68cbb043
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://crophysi.ru/aws?utm_term=free+microsoft+word+christmas+flyer+templates In PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/voforom.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/ninokogimolewuvula.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/9803734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_60079e322ebdf.pdfIn PDF document text
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/5602118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ff1fed3c6d94.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/cidOujc/gukepolamiwaxe.pdfIn PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/581204.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/cardiac_rehabilitation_textbookviiff.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/0d8b1d1c5a93.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/guwoberefijoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5ff96a46ce7c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolasesiv.epizy.com/18862956382.pdfIn PDF document text
    • http://topuwagib.epizy.com/filugu.pdfIn PDF document text
    • http://nopizapokife.epizy.com/and_1_street_basketball_apk.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5544 bytes
SHA-256: 8a929a3f0864048cd213c743d51296574e52163d943851d64edc9ebeb1768563
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10516 bytes
SHA-256: 58bd8339c23c1afecda8bcfc59382ba22f96b797e71182879925b5344e6bacef

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