Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfcb010e2601ef6…

MALICIOUS

PDF

78.9 KB Created: 2021-02-25 10:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 492daed771ce3fa1fe93b8e643479647 SHA-1: 5c2f805379c96dac96513c40b342aa2a4251b108 SHA-256: ddfcb010e2601ef6048f8534abd020b2394f2f63da458823c5f07d41657f1fdc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs, including one pointing to a potentially malicious domain (jacksth.ru), supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=monster+girl+maker+2+online+free PDF link annotation
    • https://cdn.sqhk.co/nupumusu/l2R3whc/black_screen_on_iphone_8_plus.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/gasomisulafabojuriv.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/nudibunixowurogevikubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fdf0552a924c.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/QjegjTj/dakunovepimi.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/restful_web_services_authentication_example_java.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/n9ArhjN/lekuxizutid.pdfIn PDF document text
    • https://donasidavojixa.weebly.com/uploads/1/3/4/4/134494786/nitivijomoxetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388827/normal_5fd059482f95d.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/56427266203.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/serato_dj_lite_1.3_3_macos_installer.pdfIn PDF document text
    • https://cdn.sqhk.co/libidexa/MieKjgQ/property_management_jobs_near_me_part_time.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/984016200.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/rurovikejigibu/javascript_date_format_conversion.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/engineering_mathematics_stroud_5th_edition.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 5288 bytes
SHA-256: 81b1ff3865ad4782d787271b92d755047f93fa095c4e3ad746e0b67e5240627f
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10712 bytes
SHA-256: abc283fd0f0666668fc687ae5c500eebc500dd719a5a93b269a5c2638f82272b
font_03_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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