Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad31be26b79be2c…

MALICIOUS

PDF

130.8 KB Created: 2021-04-28 13:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8d9aa3e03b40d3b71663390fd8f20744 SHA-1: 5afa2808702b0b09171ad1c1192a8f6c6028f6d8 SHA-256: bad31be26b79be2c2dcb651e29773e2e0402d6ad712c2cedd1d89e98af8ce191
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to the malicious URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 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://yafferge.ru/strik?utm_term=think+twice+act+wise+meaning+in+hindi In PDF document text
    • http://avlto.best/aircraft_conformance_engineering_servicesb10dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fd6f2a2e2069.pdfIn PDF document text
    • http://baykamif.space/tizipay6x1a.pdfIn PDF document text
    • http://antonioit.fun/catia_v5_plastic_design_tutorialoym62.pdfIn PDF document text
    • http://steelsho1.club/wudoxofetorug4oiyp.pdfIn PDF document text
    • http://mp4.design/bubly_sparkling_water_nutrition_informationo3zci.pdfIn PDF document text
    • http://expressvpn.store/kubekebuapkv.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/76936896011fqgyo.pdfIn PDF document text
    • http://jesofazom.iblogger.org/xawifozatitewel.pdfIn PDF document text
    • http://italylife.pro/paper_3d_cut_out_templates5lhbt.pdfIn PDF document text
    • http://copytoshka.ru/video_jamrud_ajari_aku_cara_mencintaimulg70o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600df73f5ba9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_c195a2a32af64bf390e378a0cf5e2592.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_85f1d1a4e9d5486c944a852600683fbd.pdf?index=trueIn PDF document text
    • http://besipopi.epizy.com/jibewozewel.pdfIn PDF document text
    • http://ziwutaje.epizy.com/nezatitita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9a0e0a-12f3-4641-94dd-530d491eff1e/linulif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3affbe-b290-40d7-832e-d3d03623cb6b/66719522749.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_31b477af65cd4dfbaf0ae3f9b03bcc4a.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_f9c7e1905bff456c95d46c409a9c552c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c084ba7-32d7-4186-8c7e-d40256822c75/libro_de_lecturas_de_primer_grado_de_primaria_1993_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf727541-fecd-4a9a-806e-55604793429b/what_does_psalm_23_verse_3_mean.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_404f5f7baef949e79df02cb154f0f62b.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_off0001c445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C445 5328 bytes
SHA-256: 4e326ea0930503b955f3203ac70a003d3f0d4e5e2d1ea1295732d6baadf70cd4
font_01_sfnt_off0001d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D654 11460 bytes
SHA-256: fe342b4bf27ee9f2ca25b0ab461982579cc0a7bc957d64d6faa7cfe04e9468ad