Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6a0e6c41093569…

MALICIOUS

PDF

81.9 KB Created: 2021-02-23 20:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a64b03e2bfe47fb39e1ec9aa4d3ae9df SHA-1: aabbe0b254850cdda78adf65c370eb97466c3a9a SHA-256: dc6a0e6c410935699f1aa1945262ef418989010a364d0e53455bb02a939868d0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=expedition+to+barrier+peaks'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wix?keyword=expedition+to+barrier+peaks In PDF document text
    • https://cdn.sqhk.co/gobajejuz/gW69khi/magic_fluids_full_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/iWdpjeS/mojuz.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/jjDPhik/environmental_studies_major_course_requirements.pdfIn PDF document text
    • http://jibuwuxopi.22web.org/arbol_genealogico_familiar_en_ingles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601df47a5b700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600bd2e25c918.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/gdwxMhj/2089504272.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/haxPQjf/3d_flip_clock_weather.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_5fdad0ffd4b23.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/7jd12ia/bandai_namco_mobile_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/hcZZn3c/tujofebosemiluxozuwogido.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/iihifUQ/fujobumerixas.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/hROFihD/touchgrind_bmx_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/8TOjiib/58967505222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunerev.epizy.com/christian_song_video_tamil.pdfIn PDF document text
    • http://xafejebefejo.epizy.com/mifir_article_26_transaction_reporting.pdfIn PDF document text
    • http://jitabemap.rf.gd/acer_iconia_a210_stock_rom.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_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 5152 bytes
SHA-256: 4ec58a5c29601dda0bfc4c515347f6ef45b515af88344003acfdcc37dbd06b1d
font_01_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 9968 bytes
SHA-256: 20716f7893d4751b67f5eec497782d56dd8ba56b6ef64992be6cba6ecb601b8f

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