Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f773c6cd7109c2…

MALICIOUS

PDF

79.6 KB Created: 2021-06-10 06:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 44f35b90bcded2e8f3017f73e7eb8f36 SHA-1: 3d1d44e347ff768e9120f5ae1c2084d506b60f15 SHA-256: 08f773c6cd7109c2fc7e7e1a80dcba17a004af9fe727dd4ed68f8cab3d8d0f7d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this phishing or scam-related activity. The embedded URLs and the overall structure point towards a phishing attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=support+vector+machine+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479470/normal_6067c25ee0bd6.pdfIn PDF document text
    • https://wowajonaj.weebly.com/uploads/1/3/4/7/134717857/8566021.pdfIn PDF document text
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/vuwiviravulep_tizukukukuto.pdfIn PDF document text
    • https://jifalefowa.weebly.com/uploads/1/3/4/7/134733665/af7abe17fd43d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_60327909adf66.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/busoselo_xojoxage_raxesejojana_rujeso.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/2468458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_605bc710916ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fe1906e61719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_6047d9475049c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_600574a83e637.pdfIn PDF document text
    • https://rojimabilaraxum.weebly.com/uploads/1/3/5/3/135314729/nexotajusiw_belukalur_rifugovugesepif_pumaremazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_602512bd474dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_602fcc2a8bb27.pdfIn PDF document text
    • https://ropumalopiku.weebly.com/uploads/1/3/4/6/134613257/81ce7cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_604d63c241276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_601b7ee34c295.pdfIn PDF document text
    • https://jejojoroliwe.weebly.com/uploads/1/3/4/3/134310913/8613500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fd220ead1c2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropotupi.pbworks.com/f/fast_and_furious_1_full_movie_download.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/f/41950374164.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/iodine_clock_reaction_lab_report_answers.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_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 5348 bytes
SHA-256: a2e0efb176cf0b7b175d8391e17f678cbbee08cc4a16da96216b7082b8bc04f6
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 11072 bytes
SHA-256: cf1e7d2dea8197929ab13a292d93b376bd7305dce3d69064113a3a5cc04e8251