Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88aec5bb4a7b012…

MALICIOUS

PDF

156.1 KB Created: 2021-03-29 16:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c7b1e576b65ad6fff9fd5b3e08195254 SHA-1: 0f80af8cd2a0d19a057538f722d635762091fc91 SHA-256: c88aec5bb4a7b0129f16d4f10bae991c5ef8693d8acfe0c1d0f786ffd26fb477
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs, with one prominent URL pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the presence of external links and the overall detection suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=fantastic+fantasy+football+team+names PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5feb8c4f8e7f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/jhjjWia/13382585162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6035ca8e430de.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/25392568341.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/budget_2020_19_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/jfhc8HF/crystal_report_asp._net_c_codeproject.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/7Rsgcie/pufarubawiba.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/a_traves_del_maravilloso_espejo_del_universo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_601e65e677841.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/49757171639.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/VEgdjbq/nezazonenisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_5fcf66f018277.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/amar_chitra_katha_all_books.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/018ddd41-a5eb-409a-9565-0e6db1bccbf1/eurydice_sarah_ruhl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81afaf15-04c2-477c-936b-fcef2882ab49/what_are_the_10_elements_of_journalism.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/coffee_shop_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/how_to_understand_the_holy_trinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1477ee-5131-4014-bc27-ec5766fb262d/afterlife_lyrics_future.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19afeb0a-761f-4318-814a-6b000642498b/49902551583.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/23111078511.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/jensen_vx7020_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/sex_positions_book_indigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c518fe3-01ae-4554-ba53-139948d2d3d6/japaranopum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e9bbea-9403-496e-ae62-ed61798e44f1/how_to_draw_fennec_fox_furry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3d2cc6-1d9c-4ed0-ab64-db4abc220951/20667430.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_off00022362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22362 5128 bytes
SHA-256: 2333adfc321422bb59e0a6dc35d74686e984f4f0ce99a2d0dd0a6015d1c07c76
font_01_sfnt_off000234d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234D8 13336 bytes
SHA-256: b6ab0e3c6af0c68593a6c14b99af7f005e09042b58742bd7e5a39917793ba4b2