Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab0a45d377e952…

MALICIOUS

PDF

84.1 KB Created: 2021-03-08 08:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa30df6bb071e1697fd8b4db0d3e2935 SHA-1: afa802e369d85657379067b138afd1aef2cabef5 SHA-256: c4ab0a45d377e952afc4149d17fd93e23afaa4cffb2568d90e5ea6e31707dac6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'conflict resolution steps for couples' and authoring information, which likely serves as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/123?utm_term=conflict+resolution+steps+for+couples PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/ij2idje/23907084635.pdfIn PDF document text
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/9280194.pdfIn PDF document text
    • https://xowarumi.weebly.com/uploads/1/3/4/5/134519529/mumasere_loziw_xudiwa.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/mupuxa.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/tiwexaneti.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/jimotapexiw-tuseg-kazaw.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/tjhDHAb/11636559946.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/5f495bf62226a6b.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/suxaxuk.pdfIn PDF document text
    • https://vasalidut.weebly.com/uploads/1/3/0/9/130969475/pagagenefavitiruvo.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/9677194.pdfIn PDF document text
    • https://ranagujiw.weebly.com/uploads/1/3/4/5/134585077/bipibigitavuvezotuso.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/f3124e0.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/f3a1866584fb.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/zimubogezisoni.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/xivitametu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_3041c1e12f5b4c1a850d0f5105424ebe.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_49596b05a51e47c89b9fe84cc5b18e64.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_c5f5af3c60274c07b4a3f28b2d654247.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_2fa585d5ec574f189f5c76890bd01eb5.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_2ca016ff6d1e4ddaaed7ff395ca6fa9b.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_3fb65cac86bb469d8131d23a1c36844c.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_bf6cc875e05f4abfb10aa81f42b8ef23.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_120e8ccbe9984d9c9b337f4deb9d1b0a.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_c3d5102df5ad4bc7857dfc4a017f47cc.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_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 4704 bytes
SHA-256: 1b7fac43ab6cb0e44f164ed866c9105fb9fb14a7a38e2808ca63652afad34281
font_01_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10860 bytes
SHA-256: 4d0ff2b62d5fc048650bf39e56379b2f65a81489b18ecacbdf55f2ca4144b0c6

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