Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac17bf83563e4c7d…

MALICIOUS

PDF

83.5 KB Created: 2021-02-27 18:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 97eb284052e878533ce3e75ed07c1209 SHA-1: db69f0403648ad438ff10951fea5c7d49384a946 SHA-256: ac17bf83563e4c7dd7bef08ee25707f8d972e80b64a359594e01a090da360ea4
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm used for SEO manipulation or to distribute further malware. The presence of numerous external URIs and the overall structure suggest it's designed to redirect users to potentially harmful content.

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://golowaki.ru/award?keyword=kayla+itsines+beach+body+workout+pdf PDF link annotation
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/fejale.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/hiehcij/best_mud_tires_2018.pdfIn PDF document text
    • http://alex-travel.moscow/19988213637vri5w.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jX665gc/melajowarevotanoma.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/jihfqZB/ultra_glow_air_power_soccer_disc.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/gejhgf7/zamajegadam.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/7282768.pdfIn PDF document text
    • http://topplafond.xyz/which_of_the_following_is_not_an_example_of_general_deterrencev60aw.pdfIn PDF document text
    • http://presentinsta.site/tamil_love_feeling_songs_tamilandagmug5.pdfIn PDF document text
    • http://tamakar.tech/launch_meaning_zoomfmkdr.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/ca5c266f0540185.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/7366392.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/xexoletapizi.pdfIn PDF document text
    • http://govnososal.xyz/73266940815ees97.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/wirusigezumep.pdfIn PDF document text
    • http://securityverifiedservices.com/best_argon_crystal_farmohgd8.pdfIn PDF document text
    • https://samovibemajus.weebly.com/uploads/1/3/4/5/134597991/wafopuzoxiju_botodexuwutez_xawekekesob.pdfIn PDF document text
    • http://teplotronic.ru/vokizagujisaganirugotjbpz.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/gjhjjjk/fujerenopezawixu.pdfIn PDF document text
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/752335.pdfIn PDF document text
    • http://dommasters.site/app_calcio_streaming_androide9mpa.pdfIn PDF document text
    • http://servicesforsupport.com/finding_slope_from_2_points_worksheetcd3ft.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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 5492 bytes
SHA-256: b85bb69bff275e65b67dda69283a86fa76044fdc0fea3c968cb6f654c6d31826
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 10824 bytes
SHA-256: 55d605db7b2924dde447e345f38bd5b51e9c4ae1eb3a84b7113c4efd4d003cd0
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c