Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4c17d92cc6b9b2…

MALICIOUS

PDF

77.4 KB Created: 2021-02-10 06:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 95694887f2f4274fad8c2cc8afb62497 SHA-1: 9b49b7d2992124d9022747ab5568801e5baa05c4 SHA-256: ff4c17d92cc6b9b2e9ef464104303053aee87a63dd406883eca8f4f2150b7491
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://yafferge.ru/123?utm_term=cuales+son+las+propiedades+de+los+materiales+y+sus+caracteristicas', suggest an attempt to direct users to potentially harmful websites. The presence of numerous PDF links indicates a strategy to distribute content or traffic, possibly for SEO manipulation or phishing.

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://yafferge.ru/123?utm_term=cuales+son+las+propiedades+de+los+materiales+y+sus+caracteristicas In PDF document text
    • https://cdn.sqhk.co/makubeku/gfg2hid/jovefozata.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/kcpib7L/street_chaser_apkhome.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/fead209016ede.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/gujitiruzadimo.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/1981828.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/if6fKOm/nofalubesofosu.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/a3a67a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408319/normal_5fed61db02414.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/c02f203a55e1a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380079/normal_5ff4f5fdaee2b.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/gixirojozogufux/extruded_plastic_sheet_manufacturer.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/58598820926.pdfIn PDF document text
    • http://getorimojaz.rf.gd/2098641624.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/faxatogeposaxaxeraf.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/ponezuredasupasunobopekif.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5228 bytes
SHA-256: 17ba49c2e16443d8dbd6c6c04cf17d8c81e7a092605b89a73b0696410bdb62d1
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 11864 bytes
SHA-256: 9fa101efa65ca76415572a438c62b409f844599c70ee1b864aec8a8aed89ad06

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