Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0631466ddbaaf75…

MALICIOUS

PDF

79.9 KB Created: 2021-03-10 17:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c044b66ac1bbc5ba772865454750b76b SHA-1: bf472a7ff7f9fb9e81b5b5f455874588ead1c5e8 SHA-256: f0631466ddbaaf7510a749fa0de6724f5e9f44f35c3c3a595cf459a066a4a774
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://soxebez.ru/award?keyword=kaplansky+commutative+algebra+pdf', suggests a potential phishing lure related to academic content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=kaplansky+commutative+algebra+pdf PDF link annotation
    • https://cdn.sqhk.co/zimalodepafo/gD3ifha/chiasmata_form_in_which_stage.pdfIn PDF document text
    • http://bilkaita.space/7112790726meuj0.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/7jghdRH/the_parenting_simulator_full_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/luheDR0/hurst_competition_plus_shifter.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/cXuiejg/99054060333.pdfIn PDF document text
    • http://lizetadolanut.iblogger.org/botukazizuvuwalufapaga.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/hfQUhdd/desudiwase.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/whjjcgc/simple_task_list_excel.pdfIn PDF document text
    • http://gakivako.iblogger.org/affinity_photo_workbook_deutsch_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/6BhaijI/47850300072.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/YhifHjc/harry_potter_polyjuice_potion_punch_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/gmgGTgj/46185811761.pdfIn PDF document text
    • http://hopecommunitynaz.com/899468294754g5bl.pdfIn PDF document text
    • http://lovelid.xyz/nijunekavigavusixubojont0grj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb5e061-64b9-4c82-bf26-eccf056d4d6c/wotuba.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_422e16ed445c4604bd7707acddd77c16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef3c319-fde0-4d46-801b-6b92b997ca44/lalifanonam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4978a2ec-99d4-4935-a5bf-2360b12898b8/80105182006.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_596f5f9eb7244f5a9c4484f8da53cf09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc34a4c-b183-4562-8e7e-5b489f6b91d3/7881517499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d443b5-c06f-43f0-bbbf-28bd0352f7b9/tekize.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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 5812 bytes
SHA-256: d700039aa5a921b44b9bd0b9af54010fbba0f68501c41b8c93d5051a31664aeb
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 11116 bytes
SHA-256: 2dfd78c0471f64a289dae1990c97e9b1c9655572e4704928493d70ed29108410

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