Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf651721f07f9f2…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 21:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 310742e8c7993a2f6cf67da4b8f62daa SHA-1: d73798a06986042f49506fd3a91133721a6ab8b0 SHA-256: dcf651721f07f9f258a5cc111c8d8f8ef4d3f9d3d7b9bcb649f9f2ff25d96187
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to a potential phishing or malware download site. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=yowhatsapp+apk+latest+version+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450889/normal_605a675deae1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6069d79ca0acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_601136150ef17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fd2da0446560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_602126fdd7959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fe516a7f16f9.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/1035665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_602c8e1fa3a6b.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/bojopufu.pdfIn PDF document text
    • https://futikuvevu.weebly.com/uploads/1/3/5/3/135349420/eb38641f22c28.pdfIn PDF document text
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/256bcba8ef2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_60616e97715f6.pdfIn PDF document text
    • https://padikolejak.weebly.com/uploads/1/3/4/0/134042397/gewoluzez_lozobilunidovab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_602c4ce096097.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/bumuzidetokoli.pdfIn PDF document text
    • https://jinepitabo.weebly.com/uploads/1/3/7/5/137515198/rafetanarinonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5ffa347182f3f.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/mokedamobowuviturefo.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/7350585.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/ce8065af-0ca4-4b09-a722-077b43547836/92578899110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125c3f0b-be61-429b-8ac5-632ed75f116c/how_do_i_fix_hp_printer_problems.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/is_jodi_arias_appealing.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/32484553063.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144843681/52326038128.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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 5224 bytes
SHA-256: 769733e0d35c69c16d0036e0a321f137a6ce19c42e4c7ef6387d3048a9a8f40f
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 10592 bytes
SHA-256: 2459978041ca08b3f028562a6e7efeeb75a9a1dc46beccde4ecfc3c02d83bd81