Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe6443d3b0f266…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 21:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3982f110ded60f6ccacf34d0aab22eb7 SHA-1: 8127abb6d8513cebe25cee86eeffa57cfb5e69da SHA-256: 0cfe6443d3b0f266967f2620f09b13da7bbecdd1138ec5e49143d485ea60802e
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 0.9992

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://soxebez.ru/strik?utm_term=the+island+of+dr.+moreau+1977+full+movie PDF link annotation
    • http://miwuzobi.sportsontheweb.net/related_studies_about_cosmetics.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/dikeregibexoribaxurozipoj.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/advantages_of_globalisation_in_zimbabwe.pdfIn PDF document text
    • http://vukogosapejofa.iblogger.org/joseph_prince_books_on_grace.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/look_back_in_anger_act_2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_5fda8fdac1723.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/sosivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5ffbe4d8db5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_6013bf1c1e2f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_604e90b96615f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_27697edc003244ecbb40ad647dffbd2b.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_40456a158cd14750914bb7b55b76f03f.pdf?index=trueIn PDF document text
    • http://leremijidi.rf.gd/ropirevizo.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_466c93721fa9423b8d287a9039f415a0.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_d5788029e71f43c982cbae8cab33780f.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/66095097169.pdfIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_aacb07cb38a04924ba4ccb0244c504c0.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/alternating_current_class_12th_notes.pdfIn PDF document text
    • http://vaxutere.rf.gd/joniketolelim.pdfIn PDF document text
    • http://sudipefenivu.rf.gd/gujulama.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_4b5e19c8ac924512b9c1bbc7cf666528.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_b2dd24f49cb54c6b9daca158e2ce6ef0.pdf?index=trueIn PDF document text
    • http://wetovokerug.epizy.com/book_of_jasher_in_tamil.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5476 bytes
SHA-256: 03347a8e507cd42cd8bb4d3410ff9f1c5db01f755142f960416fcb92e2a331fe
font_01_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 11436 bytes
SHA-256: b1e8d6491f2d86277b6f42e4e54ce230941c8b98d3be0314bebdc600022a4b11