Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fae80160c66fc5…

MALICIOUS

PDF

110.4 KB Created: 2021-03-29 08:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4e3bf8320ef48b288b8cecccdc368ea5 SHA-1: 4f15da5e390f41086c8c0fc526d8935adc38b7e1 SHA-256: 04fae80160c66fc5cc5cbf36a73bd1355872cd8cf1f55cea8d12fce05f1165fe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to book summaries. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely for SEO spam or redirecting to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=autobiography+of+malcolm+x+summary+pdf PDF link annotation
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/loluzid_lewafifilewig_joredor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_6037948a3e79b.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/novuju_gukavatip.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/e2f424c4cc4f.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/932bb8eca38910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_6043fc932830a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_60049606c2406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_6005b7880f8bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merefasi.rf.gd/what_do_you_do_with_a_public_relations_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf96a1b-dd05-4f21-beff-a49de8cd0a5f/la_divina_comedia_el_infierno_de_dante_audiolibro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411d2caa-9e25-4a0e-8fd2-7e605710de88/how_to_thread_my_brother_ls2125i_sewing_machine.pdfIn PDF document text
    • http://wagibederujejo.rf.gd/landscape_architecture_business_plan.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_1bcde65beca34ab680ab36503f61bb9a.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_a3afbf2e2ddf4d4cb851182541dabf7f.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b2b056ad7a534e98b13ccbef7cee662b.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_826870e76b9c4170b2139c08d24908a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/564945e3-c755-4687-87a9-1c0e7afcbd34/world_war_z_movie_free_download_in_hindi.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_825f16553b9e4d5b8ac0cee136eebd4f.pdf?index=trueIn 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_off0001716b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716B 5868 bytes
SHA-256: ab3febe67768dfe81e22764f190b0d5cbb8be46d8eb670c0974cd00d0b5dfb32
font_01_sfnt_off00018549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18549 11384 bytes
SHA-256: 4b8829c6da3dc6f52ce863b1185978b89bf36deab446fa63756c0a490affb120