Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78386325a4121e9…

MALICIOUS

PDF

74.0 KB Created: 2021-06-11 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5b186176f28a445f091f496163b9ffd SHA-1: 08b7e46df2f093a3cbebb260842980f8d91b43a4 SHA-256: e78386325a4121e9a0f6d023e4a6c63e2cd9e0a3e53bbbeae0dda1a4ee0636e1
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 0.9991

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://drafthe.ru/pbw?utm_term=mac+os+10.7+lion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413713/normal_60461bf752f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601b7c6ce7e62.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/danatelupodizulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fdaf062e5d41.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/xewumot.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/0142be.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/915942.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/xekanodifogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_605c6ab85ad9c.pdfIn PDF document text
    • https://sudejija.weebly.com/uploads/1/3/5/3/135390998/nubuwedopuvesuzapona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_6015fe444b183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_60546eb539918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_6056c425bd075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60bd533911fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fd8ca7fe7493.pdfIn PDF document text
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/7270976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/f/one_click_root_apk_android_9.pdfIn PDF document text
    • http://tijigika.pbworks.com/f/breville_nespresso_vertuo_descaling_instructions.pdfIn PDF document text
    • http://katexawa.pbworks.com/f/me_tenu_samjhawan_ki_mp3_song_female_version.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/145050285/marriage_resume_format.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144836190/kadupapujujew.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144556278/cbse_class_12_computer_science_book_download_2020.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/tulejizanapunevoko.pdfIn PDF document text
    • http://gaxoxim.pbworks.com/w/file/fetch/144998310/99503673277.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144522279/capitulo_190_moises_y_los_diez_mandamientos.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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 5008 bytes
SHA-256: 73f7a23ab7d2f752c858f31e4a3aa2fdcd29c29b80662f19c985a524b169d0bc
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10484 bytes
SHA-256: 5a14f2837912fc79d8f98d4c3cba04dc0881f51214cbcadb3e4a1b93ffceabc7