Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f3da6824127163…

MALICIOUS

PDF

42.9 KB Created: 2020-10-07 05:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 4af647ddf0bb60e27d9fb6c5160da8f7 SHA-1: ff04c1709f6919acdafb67eb123fca5bc7ebd8c2 SHA-256: c3f3da682412716304a52ac9a2083f7ac54466bcff0d1d642da493e0730a2b12
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=hibridacion+sp+sp2+sp3+ejercicios+resueltos In PDF document text
    • http://wedimax.jolonbathbody.com/uploads/1/3/0/7/130776078/2040666.pdfIn PDF document text
    • http://jawimip.themaximumgamer.com/uploads/1/3/1/4/131406436/tejova-vonon.pdfIn PDF document text
    • http://files.thelightersideofme.com/uploads/1/3/0/9/130969358/tepudefuwazame.pdfIn PDF document text
    • http://files.southeasternclubcl.com/uploads/1/3/0/9/130969330/fa36f6f.pdfIn PDF document text
    • https://site-1039695.mozfiles.com/files/1039695/nululijupaso.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/19944369605.pdfIn PDF document text
    • http://files.wairarapamassagetherapy.co.nz/uploads/1/3/1/3/131383645/jolunateripemam_xeremevusejakox.pdfIn PDF document text
    • http://files.amysmith.photography/uploads/1/3/1/3/131380345/5368559.pdfIn PDF document text
    • http://volarovo.fairytale-wedding.ca/uploads/1/3/1/8/131857631/1156315.pdfIn PDF document text
    • http://files.nourishlouisa.com/uploads/1/3/0/9/130969141/8243712.pdfIn PDF document text
    • http://bazes.smoketine.com/uploads/1/3/1/3/131379121/zulawego.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
    • 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_off00005c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 5424 bytes
SHA-256: f7fd9ed51b572d728dcf4f5d2fd0d68dd25945c661fb2939f7d30a76a46079df
font_01_sfnt_off00006ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 9904 bytes
SHA-256: c3828cf7946871f0ef2327d7ee7538e54fd874bcdf8e1fc045a08a0fc8c20f45
font_02_sfnt_off0000908b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x908B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e