Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b899fa5b98bdc9…

MALICIOUS

PDF

85.2 KB Created: 2021-04-04 19:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 09f7308bcc69671a5fb5b274dd44ab45 SHA-1: d903b22fb5ca3c67f995aad276553c2557038407 SHA-256: c1b899fa5b98bdc9413af2c82f4c18df67dc3764564709f1ce8423d9c9ee52e3
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting supports this assessment. While no scripts were extracted, the primary attack pattern appears to be directing users to external resources, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://gimoguvi.ru/award?keyword=arabya+rajani+bangla+pdf PDF link annotation
    • http://mandarin-fruit.space/cantina_band_star_wars_sheet_music_clarinetwy1yj.pdfIn PDF document text
    • http://copyrightshelpcenter.com/5102681462580nff.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/kusexinabus_lesiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcfa24bd40f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_60596401a8477.pdfIn PDF document text
    • http://lesantyqas.online/silent_knight_sk-5208_reset_codeaajr4.pdfIn PDF document text
    • https://zivukiwele.weebly.com/uploads/1/3/4/7/134749768/9283923.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/9747607.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/Bijgi1Q/nemufawifite.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/gFvGibZ/fastest_launcher_android_2019.pdfIn PDF document text
    • http://afracheat9.xyz/zurunuwezaxigofikikwciev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/fenix_2.0_vs_fenix_pro.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_3ec8a2e3b3f2446ca618ac79d7de5b12.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f1ad811a9b5a403998920cf4316d8230.pdf?index=trueIn PDF document text
    • http://zuvuzevo.atwebpages.com/epson_v370_specs.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/dariso.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_03163fa1054b4b51bea35ffce4e29443.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_aa513147e8e34885b7c738c5d2e0d087.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5340 bytes
SHA-256: f83351865b19ecb49a4b6ad7df0885aed24fba2e3cd563f4ff878e790ebea959
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 5576 bytes
SHA-256: 83db680dd7ac5e385d477747a60fc809ca90c3510bef7cdc5b76de31f3e22c4c
font_03_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 11184 bytes
SHA-256: 9a0e4a1f875051442570221b3160929ede392b157827aefb3e8aa3f311186c90