Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a5c239291d394a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-11 19:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e74642814327ed5114b2c3302a83013 SHA-1: 35b8379fc8c78fe8359e77dc04e8a7ba6ab2b76e SHA-256: 33a5c239291d394a17fe48a0599639a2b3ebf1e8ad292d53cfb9cca1c7fbe3a1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily corrupted, contains keywords related to 'Uefa champions league fixture', indicating a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=uefa+champions+league+fixture+2020+20+pdf PDF link annotation
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/pepebesuxafisufakat.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/bilogirewabikab-wiwudonibufajov.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/80875924138.pdfIn PDF document text
    • http://xexajume.iblogger.org/mudukilapibixokoline.pdfIn PDF document text
    • http://josebixotarez.22web.org/55441897952.pdfIn PDF document text
    • http://sallehub.xyz/weber_smokey_mountain_cooker_18_inch_smoker_reviewsnry5i.pdfIn PDF document text
    • http://zoo-taxi.site/7230406437110cbi.pdfIn PDF document text
    • https://telabafulux.weebly.com/uploads/1/3/0/9/130969700/bawojaxukabej-rurulutunabup-fasaluz-viwoxinef.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/77490493394.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/e8fb581f-203d-44c1-9009-ec486203f622/sanirebokipukir.pdfIn PDF document text
    • http://zufagubiles.epizy.com/21915066502.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/17160495849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38558cfc-21dc-4fce-b4c6-196ab50b28dc/carson_dellosa_education_careers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3b659e-25b2-4ece-9dae-c66e28e53076/starting_a_baking_business_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be1520d-6132-483d-a234-3d5e4ea37106/chicco_liteway_stroller_manual.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/lozatudijofegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77762974-a0ab-45b2-bda6-950442446d00/shoretel_230_headsets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116737b8-1135-47c7-a47b-b195b6556722/fofagalegubasajowewit.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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 5904 bytes
SHA-256: 9a97685664a7d2a17d96632d584793b128771f3826d80861963064d3cb120f4a
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 8636 bytes
SHA-256: a721c3422fffb70110f99b2684b0fe90376169037fef1976d54e2911b6e467df
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10304 bytes
SHA-256: e563e79cf518e63a58d9ebd67fc3c2f82608e675a8ddc242141e97fdb252121b