Malicious PDF — malware analysis report

Static analysis result for SHA-256 389b6e441eb38023…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 02:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bab21d01c8f5cbfb1449eb601f9397fe SHA-1: e4181655d66a5b365c61719d3a081b283c34fdd2 SHA-256: 389b6e441eb380230e101d48218ee63fcc0fba0c994465d1e71aab0f33e7d194
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute phishing or malware. While no scripts were explicitly extracted, the presence of external URLs suggests the document is intended to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=articulo+16+constitucional+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fd1456ca3274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_6031736a4cb99.pdfIn PDF document text
    • http://sofuwabafa.iblogger.org/jelafoxumalapaviz.pdfIn PDF document text
    • http://medicinfo.online/2005_honda_odysseyd06aj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_606266f3a952e.pdfIn PDF document text
    • http://pumba-timon.space/commercial_lawn_care_proposal_templatern0y6.pdfIn PDF document text
    • http://lebanage.iblogger.org/nuzosakofagirezefoxeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_603411a4cc4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_604027bec2e3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_43b3e8f11d874627a470d23696b15458.pdf?index=trueIn PDF document text
    • http://gulesovel.epizy.com/mevilejovow.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/cal_king_bed_sheet_set.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/seberinolusi.pdfIn PDF document text
    • http://folujas.epizy.com/xepuvazezodasevebexam.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_6001335da1ae4aba9bccbd200b73cd75.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_b09a6069e30043399f9189127038ebed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/cfa_1_salary.pdfIn PDF document text
    • http://daxafedijumexir.rf.gd/tepamigabalizoxinojuwiw.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_9c0e4704e7404293b6cae69f08f09f77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/35790157593.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 5108 bytes
SHA-256: 044c88f8eb9450e02a841e2fa7435d87722db71d00ac25583bc5fddfae592189
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 11100 bytes
SHA-256: f777215a0154169f5317fd2f11d92537bd433914f8c585e5ce9a54e67f0f2334
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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