Malicious PDF — malware analysis report

Static analysis result for SHA-256 8460fc34a41a8b01…

MALICIOUS

PDF

76.7 KB Created: 2021-04-06 15:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7156524c394c38572188be7114177ebe SHA-1: 181046cb8d113af855cd0f7a19fb6206607885cc SHA-256: 8460fc34a41a8b016077347841284a84d18ac82eae04b8acd9c1d41ef89834e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=the+signal+man+story+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463551/normal_5fe0ec4b864ad.pdfIn PDF document text
    • http://myfirstsite.xyz/riduwevuloxesudejeswfq9y.pdfIn PDF document text
    • http://lessonsonline.site/8691520825j6u8d.pdfIn PDF document text
    • https://birakegisepes.weebly.com/uploads/1/3/4/5/134597855/vigelabi.pdfIn PDF document text
    • http://itrom.fun/40012175412i0qmc.pdfIn PDF document text
    • http://koreanluxe.com/kibobejojowizajuderediu6j6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6054399b76fc0.pdfIn PDF document text
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/tijip.pdfIn PDF document text
    • http://pay-order.info/words_that_start_with_kneet1at9.pdfIn PDF document text
    • http://blancer.xyz/what_do_parallel_lines_on_a_x_t_graph_mean6z6qt.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/suvemutedaduxe-wukifutedixufi-kefopex-kufiretedep.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/takitasisasozeboli.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/5698062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_603c33b4642f2.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/90528831499zaia2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fdbc82d90e51.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/circle_of_fifths_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_60039aa5ad043.pdfIn PDF document text
    • http://kihepc.xyz/tercera_sesion_de_consejo_tecnico_escolar_2015_primariapbyh5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/355a7d61-3e2e-43c9-927d-99d48f979279/86956426294.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/roland_barthes_mythologies_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c917b5-1cf7-4845-96ac-b388d7bcb4b3/54534749038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3bc557a-c1ab-49a8-b2de-794ebeb1e15b/maxudexebe.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/47337309030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5d3238-8a35-469b-9f91-16776a4daf20/what_is_the_theme_of_still_i_rise_by_maya_angelou.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/78367975201.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5152 bytes
SHA-256: 8c59bb4802f14903509cec4f7fa00dcbe395efd6c30310da646180be11d07790
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10536 bytes
SHA-256: 374cd137ea40e25340188aaaf0155150bb5d733f8060391fe7a5d994fc3520e2