Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e45d9c7f4d6e99f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-08 11:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0de09b9e6edd56f3f9e1c6491af31069 SHA-1: cfb3d0ab03ad9669b3f9882bf518e084a2f1a5fe SHA-256: 5e45d9c7f4d6e99fc644a04ab659936e8cec114919cc5de28290a26a59082fc5
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one pointing to 'zajinet.ru', which is flagged as a link farm on disposable hosting. ClamAV and an ML classifier also identified this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=animal+jam+alphas+as+humans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374686/normal_6019f4a54730f.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/moruvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_600f7857ba5a7.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/kigibit.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/96423747149.pdfIn PDF document text
    • http://rodigevofu.iblogger.org/sonic_shake_cup_sizes.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/vusurigazoxivamasokekopas.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://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_a657507c20584bbba3940cb582ec1c35.pdf?index=trueIn PDF document text
    • http://tituzirafosexi.epizy.com/interview_questions_and_answers_for_software_developer_in_.net.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/tigezufikidibebuzopupome.pdfIn PDF document text
    • http://voxotili.epizy.com/who_is_the_new_deputy_prime_minister_of_canada.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_9084289fc1fd499d9c0e84ab3c655497.pdf?index=trueIn PDF document text
    • http://sufizaj.rf.gd/gopexoxigukojuwam.pdfIn PDF document text
    • http://gotutopaxedirek.epizy.com/67284100149.pdfIn PDF document text
    • http://fowebilafem.rf.gd/4396032644.pdfIn PDF document text
    • http://jeragapa.epizy.com/latest_discoveries_in_science.pdfIn PDF document text
    • http://sekizipax.rf.gd/63659130078.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_f4d434e697f1489888e813c98b5d265b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 4600 bytes
SHA-256: 08a3671d06d44a5b11e33782d4f3a82249e3e8b400f64c20fd695cda29056202
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 10920 bytes
SHA-256: 894f84f7b42291e3e3766e5f101be5878d26908b88787e95599d7fcc0eb7d1b7
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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