Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c449af605403b4b…

MALICIOUS

PDF

86.7 KB Created: 2021-05-08 04:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d94a5bd623835e93839b41a5e1c9cf5d SHA-1: aca5d3ff5f0523cf250c79d217ca09b895bd5eef SHA-256: 8c449af605403b4b7bba6dfee3fd7253b2e9d500a3634e4067c8c7157826546d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=dark+souls+3+fun+builds+pve PDF link annotation
    • http://thecabinets.xyz/muvoxagevukisojx5u2i.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/iL8QiOL/juegos_de_pac_xon_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/khjOpjb/advanced_microsoft_excel_2013.pdfIn PDF document text
    • http://weinmvc.net/spaceflight_simulator_full_version_mod_apk_android_1ib60m.pdfIn PDF document text
    • http://fc-aromat.ru/what_are_the_5_principles_of_natural_selection12ajs.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/giheNhf/zirunikojowigosokaminunax.pdfIn PDF document text
    • https://cdn.sqhk.co/pivifilogopa/xjbzwjb/busuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/iGgdcja/satofomezivegevuzadap.pdfIn PDF document text
    • http://myfoxing.online/satijudifewzmihv.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/guzutiwupeten_pasaseluv.pdfIn PDF document text
    • http://copyrightproblem.com/10354534693tu1qi.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/ercNji6/10747088621.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/6398564.pdfIn PDF document text
    • http://italy-small.space/mailchimp_audience_reportsdla2a.pdfIn PDF document text
    • http://simcars.ru/vuteduganutesifafoss55p.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jegheif/tigafigovi.pdfIn PDF document text
    • http://moekolechko.icu/boxing_star_game_wikizvoza.pdfIn PDF document text
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/fubifikogofu.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/tuxiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://totofexux.epizy.com/binulukebas.pdfIn PDF document text
    • http://wegudewabeko.rf.gd/77021875434.pdfIn PDF document text
    • http://fujesotes.epizy.com/answer_key_rscit_2019_3_march.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 5460 bytes
SHA-256: 9d49118c78b324ea46320309d3dc862b6fcd5cf0bfabda8df0d2f12344b0a54b
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 12540 bytes
SHA-256: 7eb9aac1ccae63cb6cb07fc6cb8772c31c94873ae9fbe263cdc6705246822401
font_02_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 16132 bytes
SHA-256: a209742d18bccc0dc637b9108d206994e8f1abf493328cdaf529f1cfb719ebbb