Malicious PDF — malware analysis report

Static analysis result for SHA-256 061802538e784a8a…

MALICIOUS

PDF

76.1 KB Created: 2021-02-18 07:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c658b4002c83918c36bf01d38f24a69d SHA-1: d8207769eccf7a0d710e00c5014141dc30c810a7 SHA-256: 061802538e784a8a0c27829afdcbe9c84a37a0513e58840422b7553d191ead6e
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 pointing to disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=blue+otter+netherland+dwarf+rabbit PDF link annotation
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/b7bfaadd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fff22e36e382.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/2369922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5fdacfa093d7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fffce3f5d9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fdac58ddd284.pdfIn PDF document text
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/9335701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6023d23108e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_601e4f866c4c1.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/4931358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd1fb186fcc8.pdfIn PDF document text
    • http://nogafadak.iblogger.org/agent_vinod_full_movie_720p.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/odia_latest_movie_dj_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_5fd6d060159d6.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/b73d858.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/4638506.pdfIn PDF document text
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/7038722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6020b5a251bf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ffa003a35adb.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/1356597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ff96d8da43f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumurubulofomam.rf.gd/dmv_written_test_california_answers.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_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5100 bytes
SHA-256: aec9bf36873d7abc358114d8a5b19e4b99e64c61232c10993796d74b4a111024
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 10376 bytes
SHA-256: 4c1d3bf8c025a97e17178fbcda53c0d5a05eb2aa9944a9a497c9bf13ed6780f7