Malicious PDF — malware analysis report

Static analysis result for SHA-256 0318e51b14dc4121…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 21:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f8eb58ce1ca228cb0a2d89da561ae9b6 SHA-1: 2baa4c5f92b8d9a0f1b91ba8fe671dc1b6bc7bc6 SHA-256: 0318e51b14dc4121c946eb390d398a3f7727af99e4b8b6efba7b0a6fa5db699a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=dura+ace+di2+groupset+tt PDF link annotation
    • http://zubudiru.sportsontheweb.net/watizowevivinivetaxakim.pdfIn PDF document text
    • https://furevevesegino.weebly.com/uploads/1/3/4/6/134653878/8704895.pdfIn PDF document text
    • http://momentshop.website/134488196311nnai.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/vofotij-kivonokujorulot-xavusotoweti.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/gojefukufizazivel.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/11918939879.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/8167c810.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/metatox.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/joxutikugituz_zukibu.pdfIn PDF document text
    • http://potenciy.xyz/why_was_government_of_india_act_1935_introduced0n2j6.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/jLgdhie/teaching_cv_template_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/mgdwhcH/comic_box_app_apk.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/elijah_of_buxton_chapter_18_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1431a6c-5367-4a08-946e-56e8cd1850d8/philips_cl035a_universal_remote_control_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0272c9-face-44da-b325-1e7fb8289ed9/baby_bjorn_bouncer_weight_settings.pdfIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_32bcfa9abaf9419b9464a912dd51ae8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6663ad3f-6fb1-492e-be52-2c0968150692/xeperopufupetepamiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c282810e-936a-44cf-9ff3-7eb7b61b8b3b/jovawovoj.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_b9b81f821c8845e396964bbac7444298.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/539a0e4f-d6b0-4351-8cd6-d87a6d3a43d0/how_much_does_a_mechanical_engineer_make_in_new_york.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 5340 bytes
SHA-256: b65dd4a0d6aeec3d30987a7fed84e7265e9fa2bfa5965f8be0ceb25daad16de9
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10456 bytes
SHA-256: d3e378edff3e3403a73fbdc1be104b8f61c66d52ed506f312090166acbd4bf41