Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8a38f519063e66…

MALICIOUS

PDF

76.2 KB Created: 2021-06-04 22:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0afb8f0522b32a6de69ba4363adb7f00 SHA-1: 6d67d708ddf00c2fba5895f5985595f9a496a4cb SHA-256: eb8a38f519063e665b0af5ea4fdf2a081d9ce1f4e006220160632bfe873e2dd9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cructi.ru/pbw?utm_term=dieta+cetog%25C3%25A9nica+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501996/normal_603636c16ba3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_604164fdbbbc6.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/xevolo_kimokiduxabowaz_fufubo_dafir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_604c9e7771ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ff14b293d2fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6014c59f91085.pdfIn PDF document text
    • https://fegojobakib.weebly.com/uploads/1/3/1/1/131163858/4913283.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/afdfcf6b80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fcabd30a6250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67b21930ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fd8b342cd418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_60632a90c90d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_6063a502250ff.pdfIn PDF document text
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/a9ccea0f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivupored.pbworks.com/f/cards_against_humanity_green_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86902a87-efe8-44bc-9e90-21a82f4019fe/how_do_i_fix_e5_error_on_my_hisense_air_conditioner.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/f/31111161952.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/ver_persepolis_online_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e53a364-56f3-4158-95f4-6634aa806038/53627966761.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/34935513666.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144577767/27526443118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e941bd1a-8595-406e-ad34-ed135c4a84d9/gozilaranosabit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e38196-adb7-47a7-9617-2ee338076460/wim_hof_method_app_store.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5280 bytes
SHA-256: e178bc73ba4016f7b5836d532f8c42962df2781111bc3be150f9c932cfd0dcc1
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 12836 bytes
SHA-256: 12d86b2a2722796e835daa3da7fb4e2b2241b03f9b0a462191f81c91e607dd83