Malicious PDF — malware analysis report

Static analysis result for SHA-256 405b90c8c53dda6b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 00:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b39d3ce87cee1b03db6feb58636df1c9 SHA-1: a6ebeacb5d98202d9a86d276e7dd507907045db6 SHA-256: 405b90c8c53dda6b29f32602e3a327d6b78ec09b93d1c48ba74cc3527f349edc
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous URLs suggest the document is designed as a link farm to direct users to potentially malicious websites. The embedded URL 'https://maypoin.ru/wix?keyword=imvu+hack+2020+download' is a primary indicator of this phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=imvu+hack+2020+download PDF link annotation
    • http://freehookup.xyz/verb_patterns_gerund_or_infinitive_exercisesl2185.pdfIn PDF document text
    • http://wadipogi.medianewsonline.com/astable_multivibrator_project_report.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/aireadores_de_paleta.pdfIn PDF document text
    • http://complerbnp.com/joropexukefaza1p47x.pdfIn PDF document text
    • http://hempmap.ru/2003_honda_accord_body_parts_diagram6x3ht.pdfIn PDF document text
    • http://workmonster.net/1698538153c41tw.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/xexuzotomewasivusawobap.pdfIn PDF document text
    • http://gosezan.22web.org/54035381650.pdfIn PDF document text
    • http://martakkord.ru/pairs_cricket_score_sheet_20_overs4wagj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_c292e13850c543e09835bef8997c5f82.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_5cce39b83d1741d0aa845612ecf38c8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/60146115648.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/tojonomunanogujefatikino.pdfIn PDF document text
    • http://vuwesijodu.rf.gd/vefexavegareguvexo.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/59715369275.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/simplifying_algebraic_expressions_worksheet_year_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/nickel_cadmium_battery_advantages_and_disadvantages.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 5332 bytes
SHA-256: 8a8d4914303b2ecbececd3dc7826b9dd4744ba484eb7571f4df2095c99e6dc50
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10768 bytes
SHA-256: 3b3385355040f83099b278f1d1425fd2045016dd60acfabe4bfd26174bf2bdd6

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