Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d44cf48f66f85dd…

MALICIOUS

PDF

77.0 KB Created: 2021-05-14 15:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fb65774a0afc0200d02bb8b0717dd473 SHA-1: e7b3f73b61aa1498abf6ecf1f64cd0ce4038bb3b SHA-256: 3d44cf48f66f85dd9aa338349e7405b6cc010d04307bd5269ba317800c1404e6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of a 'utm_term' parameter in one of the URLs suggests a phishing or marketing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=la+liberacion+del+espiritu+watchman+nee+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418197/normal_60418b0932f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6016ebbb2a594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5fcbc1cb2ec67.pdfIn PDF document text
    • http://study-english-04.space/53724684378z1mii.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5ff79a3d73f65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_6005359eb0d70.pdfIn PDF document text
    • http://antileqphh.site/galovobifese2u2.pdfIn PDF document text
    • http://esplus.pro/abnormal_psychology_dsm_5_update_edition_8th_download65ctq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_e123d797a8784334909f1ef8accdcc93.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_a70f8ceb6ed34b8284218dbf3bd6fcf7.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_9ce67bab390546088a66ac2185274c76.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_3d7a4cce3d69486cb0fa1a13435de25b.pdf?index=trueIn PDF document text
    • http://fotoburiwolof.rf.gd/transformational_geometry_worksheets_grade_6.pdfIn PDF document text
    • http://xagudixuzafet.epizy.com/dulevufikikuxopaduvidekat.pdfIn PDF document text
    • http://bopunuzas.rf.gd/bandicam_free_with_crack.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_9fb2bc6675e54f0f98d27d03994f6128.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_4ff812e881eb4c7d9086734071205f6e.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_cf56d36d1d7847dea0672838851b03a6.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_0039c86936fa4c5a9862042edf53fd79.pdf?index=trueIn PDF document text
    • http://wosimudekefa.rf.gd/ilae_status_epilepticus_guidelines.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_ab2e5cde26e446f8bd0d146f93f25e32.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_160d1fccd75749e3baf0cccd2c36adef.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_c0a3f58d189f477ab7cfa5cc11561313.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_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 5740 bytes
SHA-256: 43074e9260f157a6aec691a3ec4e5bd0bbb72321fc85919f2b7843bc89e4cda2
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 11888 bytes
SHA-256: c1107438f878c4240df36deafa1288937b7d2c5dd85322f3db04abbfd801ccc0