Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8313bdd91398b…

MALICIOUS

PDF

79.5 KB Created: 2021-06-11 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3b23e118a2044854363c62ee288f7782 SHA-1: bb69c714629e4f66a4f1d2843649789fe47b8056 SHA-256: bbd8313bdd91398bfd450f8fb5724129d41abbd50d71ad2e74b5a68f24dffeb2
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/pbw?utm_term=pdf+resize+500kb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd22655ef83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_6052b4c4298b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_60620911c663e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fcaa23a718fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_60c1e061a9949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600bd9018e4df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fe04de525eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fe3c170ccb48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5fcb4723c2f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_6045fd1f25da2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d9a686a7-5af8-4ca3-91c1-7accd4406d85/roland_td_6v_manual_espaol.pdfIn PDF document text
    • http://kejufavo.pbworks.com/w/file/fetch/144821391/68626438723.pdfIn PDF document text
    • http://kavuruxu.pbworks.com/f/how_to_download_fl_studio_11_for_free_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aae4aa5-bb75-4fbf-976a-b1a259bca28e/kulamafexogimifavoz.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/f/chemistry_matter_and_change_chapter_6_answer_key.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/f/dewatexi.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144665163/5709007103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf42e55-e17d-4acf-bbb3-7ae7cf6c4e52/mortal_kombat_trilogy_raiden_combos.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144714825/cuckoo_rice_cooker_repair_parts.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/zofiduludel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518ab0a3-b519-4bbc-9b79-6661263f67dc/70848135331.pdfIn PDF document text
    • http://najajufuf.pbworks.com/f/rapport_de_stage_mcanique_automobile.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/dr_mata_rcn_capitulos_completos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26890abd-d048-4475-8e43-5f835241c8ac/90603960089.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 4672 bytes
SHA-256: fe1177ab7f1a7039eeb35902cc955da608762c675670428ed414ef32deedce85
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 11484 bytes
SHA-256: 05f8e4adb2bcb7cb7491ccfb7fe7a4070a2db8ff9c1effe0379ae54fca9b8259
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71