Malicious PDF — malware analysis report

Static analysis result for SHA-256 86452b3f4dfaabbb…

MALICIOUS

PDF

88.9 KB Created: 2021-02-28 04:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b9f8fc0c8b38af925d07df02ca34f008 SHA-1: 4886fe32ea270979144135e7ea975864c951036d SHA-256: 86452b3f4dfaabbb5875a5c2fb860f129cd80e0c838119a94ccda586e91776e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=what+is+1.2+million+in+standard+form PDF link annotation
    • http://dehydratedoriginalgoodness.com/9806049702042u13.pdfIn PDF document text
    • http://urolog.xyz/90610484084uwcir.pdfIn PDF document text
    • http://trastenmyqort.online/french_english_cognatesj9zfj.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/sowajupikuxeda-ziluleforokemu-tebivis-natobojesugofe.pdfIn PDF document text
    • http://dragonflysagewellness.com/the_upside_of_stress_kelly_mcgonigal_downloadkcqb5.pdfIn PDF document text
    • http://arthromedro.xyz/46658287911cfzfz.pdfIn PDF document text
    • http://xotizel.iblogger.org/11372531991.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/9cb7b0.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/7356317.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/513016.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/lakadutof/tobap.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/42798581734.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/react_bootstrap_login_template.pdfIn PDF document text
    • http://resuzebapaluga.rf.gd/salupojurarozejo.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/breakthrough_2019_mp4.pdfIn PDF document text
    • http://wafogaz.rf.gd/cavernous_malformation_intracranial_hemorrhage.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/10027492853.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/kowixavobozafezod.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/wubitopimuzixuwiw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 5376 bytes
SHA-256: 31dbf6fb89e460ff38594c51cfacd640c50b7f649f162a85da75448599e0e2f9
font_01_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 11704 bytes
SHA-256: 5039d4b99e0e635082595bcf682a82657f46181e5d85b197f4ce93854ffb2414
font_02_sfnt_off00014076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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