Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b089fe566ea60d5…

MALICIOUS

PDF

77.3 KB Created: 2021-06-11 00:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9fc1a450e18adad2e16459a637515c69 SHA-1: 672d6e87810473002fd06ca48484f4d8a2cff032 SHA-256: 6b089fe566ea60d54e079ae34bf450a49c23f947472ba332b23031f7c2b19ad1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'unused codes for robux' and the wkhtmltopdf tool, suggesting a phishing or scam lure. The presence of external links indicates an attempt to redirect the user to potentially malicious websites.

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://pistant.ru/pbw?utm_term=unused+codes+for+robux PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460251/normal_602a44890cb8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6056d31da6d65.pdfIn PDF document text
    • https://dinufipaxa.weebly.com/uploads/1/3/4/4/134440308/6592176.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/472d5.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/masorokafinin-nitej-tekavipawanuse-masajawunem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_6067dbcd48084.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/muwan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_60bb113721ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388040/normal_5ff17f26d4dd8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443819/normal_60b2bbfaaef4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5ffb3eb42d851.pdfIn PDF document text
    • https://vabijerokajesi.weebly.com/uploads/1/3/4/5/134595953/bisikimelerowej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_60203c8222940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_60c03a343288b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6011a6dc5fa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_6064b0f2a19f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144724029/sejireraderumosokodubil.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/145051599/zumabak.pdfIn PDF document text
    • http://rumusapage.pbworks.com/w/file/fetch/144896031/tujhe_kitna_chahne_lage_hum_film_version.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/adobe_creative_cloud_uninstall_command_line.pdfIn PDF document text
    • http://pesumireg.pbworks.com/f/tepepufadigikoxorasupup.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144638571/mazda_3_repair_manual_free_download.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144458340/kasululezedepuvatimelib.pdfIn PDF document text
    • http://junerew.pbworks.com/f/28823151365.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144518964/wondershare_filmora_manual_espaol.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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 4972 bytes
SHA-256: 453a12553c9b9d3e2b35ff964599fbe0bb5c7920973a6480c877c9c21678f361
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11384 bytes
SHA-256: 2203b5db0d64f25880018a24eb322b4578bd674cc72c85f177c3350d27d85793