Malicious PDF — malware analysis report

Static analysis result for SHA-256 7577656fb6d3919b…

MALICIOUS

PDF

86.3 KB Created: 2021-03-11 21:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d46447cacbb10fb27b9812a7ab2bf49e SHA-1: d0713ecff5fa21eaf3b97adf1a5e9acfa641f382 SHA-256: 7577656fb6d3919b18e4fb9f42efa9dba0f1e38ef9608f60ea4a41098427a6df
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm designed for SEO manipulation. The embedded links, such as 'https://crophysi.ru/wb?keyword=after%20we%20collided%20full%20movie%20online%20youtube', likely lead to phishing or malware distribution sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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.
  • 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/wb?keyword=after%20we%20collided%20full%20movie%20online%20youtube In PDF document text
    • http://yildirimotobursa.com/ansible_interview_questions_and_answers_for_devopsudshd.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/ugcjDsB/44393697020.pdfIn PDF document text
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/bcb068c18837b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5fe8c13bbd9f4.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/jebazeni_fapegovusor_fexapurofuk.pdfIn PDF document text
    • http://usacarins.com/excel_2016_shortcutsry9j6.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/dztieha/95629592109.pdfIn PDF document text
    • http://beremoter.online/sinerumodr5svx.pdfIn PDF document text
    • http://baltika-trans.ru/xugorafizipun1l35a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_600578f7dc8ed.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/havDgne/xufanagejakenutixinijubos.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/dPjjKmM/list_of_top_10_universities_in_america.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/jjimAha/8339667827.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/1icIhai/stormblades_apk_down.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6041e034d25a1.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/dogutapek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_a5eb9d401b3f40e4bdb848d0e80a953f.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_5949ef5cb6274d5e92aa2cc94652ba30.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_2f2a7aaba7f8491f900bde42e2d1b8ee.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_018cb67a868e413980fbe4864fc356dc.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_0c849777f32d4fb0907cf201513d4d70.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 3080 bytes
SHA-256: 3b6c3edccbbdf68622c80e44ac099bd4bffa00507f4f1bc839f0bdbf087aa810
font_01_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 5164 bytes
SHA-256: 1d75317610453532d7928c1f8f58a6d4edaa3b66eb9da30efa96bf3c604bcf78
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 11548 bytes
SHA-256: 573e8c056efdad246e8f05243e802cdc514d9080a925781f47125669fa056b2a

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