Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bf77f16dbed960…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 13:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5cdfda5cac557895ad71a9b4e2dd85 SHA-1: eb8c34d285a7c729189e2062522c5cc83d19dc5d SHA-256: 21bf77f16dbed96079cf2f4e4af61750dc45466b9a6d064b526587a4317de3a0
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=chapter+12+geometry+test+form+a
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/venizoxularal.pdf
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/gedixavajolagozor.pdf
    • http://befujukipepejem.mygamesonline.org/bixetixajusedosunopunal.pdf
    • http://memisada.mygamesonline.org/43755553013.pdf
    • http://bukuminuwakub.mypressonline.com/gokupijatokamez.pdf
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fe1cd433c646.pdf
    • http://sugalomiwuto.getenjoyment.net/sepsis_guideline_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_6047aa0e15647.pdf
    • http://nitafibejuze.mygamesonline.org/18171205654.pdf
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/puguwenum.pdf
    • https://static.s123-cdn-static.com/uploads/4370319/normal_5ffa36d01ad7c.pdf
    • https://cdn.sqhk.co/vitelodikef/hb2hcjd/vumazudewipisexakubo.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_60143b047ba66.pdf
    • https://cdn.sqhk.co/zapiseniw/SOidjix/nasacort_nasal_spray_ingredients.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilepobafomunow.atwebpages.com/gobevuvomodusuzofifiredux.pdf
    • http://duziroro.myartsonline.com/95168484081.pdf
    • https://uploads.strikinglycdn.com/files/5166595e-eba1-4afd-904f-175ef2519994/el_codigo_del_dinero_audiolibro.pdf
    • https://uploads.strikinglycdn.com/files/cb09e9da-26ec-4e9a-908f-b6d8898e65b2/how_to_learn_chromatic_harmonica.pdf
    • https://uploads.strikinglycdn.com/files/7e41c988-7527-4bc1-820d-380c531f4e92/5_paragraph_operations_order_powerpoint.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c9.bin
515d55315f08e7aa8b446f0afffdcc2c6804bbdf6190c8eb64a6da504b4a7c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 5476 bytes
font_01_sfnt_off0001074c.bin
fd98c463cbed95e270efd329dd03687d4102028f99aa59bc40536dbcb5e8e816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 10880 bytes

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