Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfc3db3f8f849b6…

MALICIOUS

PDF

73.5 KB Created: 2020-11-13 15:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 13992e25ddfcf93073de776d4a1dab27 SHA-1: 7b71db2c6996aa48f49da3fc3908cac328166ac6 SHA-256: 6bfc3db3f8f849b62d5a5154a261cad50abe541452afb04893f9bfa297faf8df
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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=friendship+day+special+photos+free PDF link annotation
    • https://puduragasesalot.weebly.com/uploads/1/3/4/5/134581755/deab83de1.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/208737.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/kisidajulawegif.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/6483785.pdfIn PDF document text
    • https://jijutuvexezepor.weebly.com/uploads/1/3/4/4/134444828/fuzatebab_kexakafis_wuterotepivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/ramolaxewesojivusajakuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a386ec96-f36b-473f-9f17-f93094838ce2/what_skills_do_scientists_use.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/bulavafegolobuluso.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/hcm_2000_signalized_intersection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4fbbe1-e5ee-4a36-9116-24a08bce977d/sawatofup.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/dorujebiwiribepidobiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f9f061-12ce-41f2-87d4-6671c4922969/sozasofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1626f3b2-eec6-4180-b28c-aa0a143584e3/38346149416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d0f180-9bde-4ab7-a739-f0f1d07eed77/84074004951.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 5088 bytes
SHA-256: 113e22a5e52f12b9be3507ba8a2d577a37a2e783b92828aa3a8793e4ab21cdad
font_01_sfnt_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 10704 bytes
SHA-256: 36a685cf1e35bacdbce264ddeb1fc43b8fcf6b885787c0bdad490eddb0e92ae1
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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