Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71a9ecbbca8809b…

MALICIOUS

PDF

98.6 KB Created: 2021-02-21 10:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a3b4b1414e4d152730eac16ca14b549 SHA-1: 8d25a3e70c58624b83126d6a3d4c9f9fcb67017a SHA-256: e71a9ecbbca8809bdbe74bd9edb0d6c5358ff2e6a13f7fab4e7765c864c70e63
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/wix?keyword=sd+abandoned+city+escape In PDF document text
    • http://wegansit.space/lorupim0mmk9.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/a991af6c13694.pdfIn PDF document text
    • http://velesvoyage.ru/functionalism_william_james7tfjo.pdfIn PDF document text
    • http://heliusdesign.ru/zajamojetedexubajewinofz0x4.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/71f055b80.pdfIn PDF document text
    • http://dasukegejiwav.iblogger.org/infinite_series_calculus_2.pdfIn PDF document text
    • http://ericksandoval.com/viniplus_ultra_sherwin_williams_es_b3icn4.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/263a3adb828edb0.pdfIn PDF document text
    • http://moneymaya.site/r_o_ka_full_form_kya_haib7zko.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/vozori_zuxolaj_robig_bedowi.pdfIn PDF document text
    • http://amsidisi.xyz/54293185160stqae.pdfIn PDF document text
    • http://vezujabajiwive.22web.org/job_interview_questions_and_answers_for_office_assistant.pdfIn PDF document text
    • http://sumekitisivetab.iblogger.org/bihar_state_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxumojidozol.rf.gd/jolav.pdfIn PDF document text
    • http://bituxezemas.epizy.com/79473238623.pdfIn PDF document text
    • http://mibobugaf.rf.gd/29284879235.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/guide_to_basic_medical_terminology.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/sirowofewazolazudisu.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/autocad_civil_3d_2016.pdfIn PDF document text
    • http://puxezupokefip.rf.gd/18294585358.pdfIn PDF document text
    • http://zifasodokid.epizy.com/colorado_rockies_hockey_uniforms.pdfIn PDF document text
    • http://foridifakusexum.rf.gd/6120721214.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/takanofutifir.pdfIn PDF document text
    • http://kojodidekojamu.rf.gd/96313279225.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 5284 bytes
SHA-256: da2f17a7395181558c406ef1f58f3a775432fcc26102d810b06723b61c647dcf
font_01_sfnt_off00015921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 10456 bytes
SHA-256: af46d71e3395e69ace4794be43612a1bd5104aef55cb8d4c299ee01ec74ab5bd

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