Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3330d210609e80…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 12:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dcf88b641d2924526ec9552ff3538967 SHA-1: 0abcb3193ad6b7131dc48b143d9a1b1a2e87053f SHA-256: 4a3330d210609e80e66a166b71b2611620acb809a8588616816d8ac69c2aa301
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous suspicious URLs points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+clean+a+whirlpool+dishwasher+filter PDF link annotation
    • http://bovewitavivebu.getenjoyment.net/alfonsina_storni_tu_me_quieres_blanca_resumen.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/bgtjjbj/kufigixolejojin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_6008c15058ed9.pdfIn PDF document text
    • https://pefiritiz.weebly.com/uploads/1/3/1/4/131453982/8386c31ad16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fd6fd12c0f02.pdfIn PDF document text
    • http://wivejudotimog.22web.org/android_studio_ndk_build_log.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/day_of_tears_book.pdfIn PDF document text
    • http://faxobasom.22web.org/57647411093.pdfIn PDF document text
    • http://monubaz.iblogger.org/face_app_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_60347187eacbf.pdfIn PDF document text
    • http://pirizatifi.iblogger.org/electricity_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirexadugimog.atwebpages.com/solution_manual_for_data_communications_and_networking_by_behrouz_forouzan_5th_edition_complete.pdfIn PDF document text
    • http://nadiripu.epizy.com/giguzifajobofuluxuzuboka.pdfIn PDF document text
    • http://tozoxefig.rf.gd/43441947393.pdfIn PDF document text
    • http://xusijaxux.rf.gd/blank_calendar_template_november_2019.pdfIn PDF document text
    • http://botalibinizor.rf.gd/70070249718.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5296 bytes
SHA-256: 21703dc10f93afdd8184c957d569182d945588ea48428dbab8a0db43520e1f75
font_01_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 10496 bytes
SHA-256: d3fb838da84d730a272ae753d24309653a24162500d33ab99d9de77385db0996

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