Malicious PDF — malware analysis report

Static analysis result for SHA-256 f377cd0f045fff1b…

MALICIOUS

PDF

110.9 KB Created: 2021-04-04 17:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b70e317edeabe020bfedc3e89e0a09ed SHA-1: 4163fe1ace189ee3a775945456edf0ab9418f663 SHA-256: f377cd0f045fff1b65bfe1cbca8c3f938e45ca5619f8708909ddbf1d7342e70c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and potentially used for redirection, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains strings that appear to be part of a lure, such as 'Navy eval writing example'. No scripts were extracted, but the PDF structure itself facilitates linking to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/aws?utm_term=navy+eval+writing+example PDF link annotation
    • http://jigikujed.scienceontheweb.net/pelijariresus.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/33087053417.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/55932407745.pdfIn PDF document text
    • http://hookup666.site/corporate_responsibility_sustainability_report_airbusd0s9m.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/fgQWBM1/37474584566.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/hf1PCjh/horizon_hobby_tech_support_email.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_601559caa8a2d.pdfIn PDF document text
    • http://tikovg.xyz/immanuel_kant_philosophy_of_self_summarys0865.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/modele_attestation_d_emploi.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/6MPDiiT/rojebuxovitumapovimiwul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fc69235bc904.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/bihfwPQ/pejedelimilabuzabuder.pdfIn PDF document text
    • http://jofigapowewumaw.22web.org/64559425366.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/xogejebazur.pdfIn PDF document text
    • http://takudogifox.22web.org/family_meeting_agenda.pdfIn PDF document text
    • http://kiloritijuxat.iblogger.org/56014872314.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/EPhepjg/filosofia_del_entendimiento_andres_bello.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejiteviv.epizy.com/botonosigewaxizomataz.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_54bed7135d0d412db833be8155644bc1.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_7b1c83b174954c478602f5df348955f3.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_c44e14468fad42c7adbc37f6a1c7806b.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_439c56283972465a9772cb11bc1d6fc7.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_ab994ea531e54fadba6919812cdebb5d.pdf?index=trueIn PDF document text
    • http://towilisok.epizy.com/conair_clipper_guards_2_inch.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D84 5252 bytes
SHA-256: ce5f2e8bdf4c445dff08f2307c6999f677cd7575012c4317a1f20b85a62cbd5d
font_01_sfnt_off00016f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F73 11596 bytes
SHA-256: 87a123afe51bbcb586c64e71f0ae928bab0911dcd30535877d83baf888c4c076
font_02_sfnt_off00019701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19701 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501