Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4aecf7443aa429…

MALICIOUS

PDF

74.7 KB Created: 2021-02-21 03:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d748996ae6c05cf2c842751643a78483 SHA-1: b36ff3c6f85181c6d08cf963f91e89050fbe9f61 SHA-256: 5f4aecf7443aa429d80eddbe6e147e33a2fa091b9224830ce30157f5fd507363
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to further malicious content or downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=what+is+the+meaning+of+trophic+level PDF link annotation
    • https://cdn.sqhk.co/voxoduvi/guhfigb/fafitowul.pdfIn PDF document text
    • http://tiktokfrance.fun/definition_of_formal_assessment_in_educationyhchx.pdfIn PDF document text
    • http://stroy-level.ru/platane_blattform_blattrandfruis.pdfIn PDF document text
    • http://itasda.online/jinenafebidifalutixowuwivb9bze.pdfIn PDF document text
    • http://nujevujem.22web.org/safexixe.pdfIn PDF document text
    • https://cdn.sqhk.co/muvenetu/AijZmij/levobudusozilil.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/4zDpxhd/vault_app_lock_pro_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5fece9420b19c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_600650503f020.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ijicygd/paypal_customer_service_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/0HicP2i/terminal_block_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/jqyiaGo/business_project_manager_resume_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/bhdzhic/construction_assistant_project_manager_jobs_houston.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejotuwusa.rf.gd/lizzo_truth_hurts_piano_sheet_music_free.pdfIn PDF document text
    • http://fevufanitefega.epizy.com/descargar_batman_arkham_asylum_comic.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/wedding_ceremony_program_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bawli_tared_song_video.pdfIn PDF document text
    • http://boxogegifenefi.epizy.com/45581020952.pdfIn PDF document text
    • http://sofikej.rf.gd/tatukisewutebupi.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/performance_assessment_que_es_en_espaol.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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 5500 bytes
SHA-256: 854aa09bcedc94e90af244dbe7f76416294c5a687ef9a2e0103b06ae4ab42f62
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 10592 bytes
SHA-256: 8ac9540db0ddecdb63609134b2da1b898414cddc3cc22d90938f27839299cf53

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