Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f416a6cc1921e9…

MALICIOUS

PDF

77.8 KB Created: 2021-06-06 11:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e68cf813b7c566d298ed18a56c59a145 SHA-1: f2e304bd7310d68e92f4b00ae0f807f20b1dfbbf SHA-256: b5f416a6cc1921e94214d2f1ad599cbae5e8be1792d2ebdc397ab3a62a1efd46
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the high number of external links and the nature of the heuristics suggest a malicious intent to redirect users, possibly to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://pistant.ru/pbw?utm_term=how+to+wash+a+waterproof+mattress+pad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478687/normal_604937ebc3c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fe64b0cdc96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459791/normal_60264101a5dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_604674ff28785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd67eb7efabb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369802/normal_60b4b13f8b51d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_601a3f4618981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_6027c2d815f5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_604e5ed48a4a5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4502819/normal_60b1f780f41f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_603ac8477bf01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc8503929a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_60081c04836fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_60236e2619ece.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jetipufagi.pbworks.com/f/difference_between_galvanic_cell_and_voltaic_cell.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/w/file/fetch/144604101/administracin_industrial_y_general.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144626157/instagram_downloader_apk_for_ios.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144467250/37504599067.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/letter_format_for_fire_noc_renewal.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/fast_and_furious_7_full_movie_in_hindi_720p_filmywap.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 5300 bytes
SHA-256: bf4540430df6aa34177e05e65d7e191a718b68216133f98b1ae7df89605eae1f
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 11148 bytes
SHA-256: dabed97d88297f85663b1186c17826fb8331cb685ea40604e6a916c67c3d97ff

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