Malicious PDF — malware analysis report

Static analysis result for SHA-256 1532664c01534c77…

MALICIOUS

PDF

78.5 KB Created: 2021-05-17 03:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6ebcbc1cda12d9befa907625ed8abe59 SHA-1: 1b193f99f313f4aad07a243c4cecc6c00b59bc29 SHA-256: 1532664c01534c7740afb26c4a95047785c06e6d81169797ae0c5c8ba78af8cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is https://jumiwimov.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=wasserman+all+of+nonparametric+statistics+solutions+pdf PDF link annotation
    • http://vemasujananexu.22web.org/suwedisipezupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6013bdede8d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_602c34e14994b.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/dgdIxGy/furious_tank_war_of_worlds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453890/normal_5fcfafd132f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_5fd131a221fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_603d21bb40375.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/ghKORZu/tiktok_like_app_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/ew4ig4G/vocopro_uhf-_5800_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_60530b9eb94de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_603e3830e38ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_606e6a9faf9df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_a6c441ae875a4468ad006e00da649443.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_3a48e4bbaa3d460eb3c7d8ee1ef0f6e8.pdf?index=trueIn PDF document text
    • http://kexafaxepel.epizy.com/national_library_kolkata_membership_form_download.pdfIn PDF document text
    • http://wobemiko.epizy.com/libro_baradit.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_5c4f45e3dff740a99532801b751d588c.pdf?index=trueIn PDF document text
    • http://fakuzilezozo.epizy.com/90656158403.pdfIn PDF document text
    • http://nifopufu.epizy.com/aparato_circulatorio_unam.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_ea2f2aa9745e423a93e7c1f193978ae9.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_a557dc7ca58e426cad3a7a34ce5db5e3.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_f1c4f09509ec4c43afe3d3e2a82a0bcb.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_67eecd8b6fdd4d5d869f45148cd656a3.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_c458d224eaf147b5aab50a13cedba703.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 5312 bytes
SHA-256: c393f2c9484839eed9452a2974eac391dea398df090c475f82539672495b4284
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 11244 bytes
SHA-256: 49e1a7c8ffa7ec845ae246fcf15c4f10de11e36605e42fec5bc21f1dbc846706

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