Malicious PDF — malware analysis report

Static analysis result for SHA-256 8050270ff666c70f…

MALICIOUS

PDF

85.3 KB Created: 2021-02-16 16:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 764b35f631b5626a1a61a872d8ab09d4 SHA-1: e8cd3f01b5317279a98c300b47eb5406c2b5afa6 SHA-256: 8050270ff666c70fdf83a1ae75d588bda1012c56ba1f39cfe7746d0f18371a6c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=pin+and+guy+emoji PDF link annotation
    • http://espacecmb.xyz/apple_watch_canary_yellow_sport_band21qol.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/xuxudufutelap_raworaduje_gowapelizavu.pdfIn PDF document text
    • https://vewirorerisemi.weebly.com/uploads/1/3/4/6/134627211/gadet.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/vagudekozefodabapajonibi.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/456432.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/jafajem.pdfIn PDF document text
    • http://masevetito.22web.org/catia_v5_sketcher_workbench.pdfIn PDF document text
    • http://wonder-ita.fun/dekidect6cb.pdfIn PDF document text
    • https://xarefiliji.weebly.com/uploads/1/3/4/7/134735925/geniludi.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/4382147.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/guzumemalobagir.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/xudezafimu.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/183e607edb85459.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/shrek_2_torrentay6ty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/wobadinegenelib.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/84394120624.pdfIn PDF document text
    • http://losamipivoku.epizy.com/oci_application_parental_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/89960095060.pdfIn PDF document text
    • http://kanisal.epizy.com/kewinipilufedapawu.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
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 6548 bytes
SHA-256: b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 5020 bytes
SHA-256: d69c6ba0a2c597e51defdc26b747786dcc06e407ada0df27136dce8c850023b6
font_02_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 4492 bytes
SHA-256: d710c1cf7bb99dd388fa1bbe7d073328fa1677edcc7ee7a11e0ee5061147739e
font_03_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 11456 bytes
SHA-256: 87546c53fa4017c7867855311ccc78fcde41040ca370c119cdd1a8707c52f774
font_04_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 19260 bytes
SHA-256: d90a355d93ef8d3c87b6009c5802e7094f5ce7357d0220c98fb6c758a2afd967