Malicious PDF — malware analysis report

Static analysis result for SHA-256 721cffd382f570df…

MALICIOUS

PDF

75.4 KB Created: 2021-02-21 10:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9cf258079194f733c9306b20c3aa37e0 SHA-1: fb1d3200b7f2064b1a154d64fc6cf813f7326a67 SHA-256: 721cffd382f570df945713e8b2fd1bd28c2bef4f908e482e0929afb01de3f231
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external sites, suggesting a link farm or redirection strategy. The primary URL, 'https://crophysi.ru/123?utm_term=bojack+horseman+season+6+episode+12+script', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/123?utm_term=bojack+horseman+season+6+episode+12+script In PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/sozorevedomima-zatipuwejesokel-xodutorefad.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/dogisorudak.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/7577072.pdfIn PDF document text
    • http://a1metromovers.com/storm_of_swordsquxas.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/vidadaviwal/zaxoraranasosufax.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/9395209984.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/222_guideboard_road_clifton_park_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/moxademukixavijut.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/29483809301.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/57754494984.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/amphiphloic_siphonostele_information.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/el_alienista_caleb_carr_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/latest_blouse_back_neck_designs_free.pdfIn PDF document text
    • http://suwuxuk.epizy.com/direct_speech_worksheets_for_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/xujenimalulunukuzeki.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_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 5808 bytes
SHA-256: 079fe9176c104ab04c2b34b9cb939be50f8ab4631ce1e1e9c4430fe1c0cca599
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10952 bytes
SHA-256: ee1657d6e4c783a5bea87c7bda122230aa5cd7098990844fbb6d3e9f7dd732e9

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