Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ed0467a8fa3604…

MALICIOUS

PDF

78.1 KB Created: 2021-02-24 18:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48ccb7e7fdd4a9c650137ad151d6778d SHA-1: d17bf3e7548a0130f521d1112ab444855cede41b SHA-256: 49ed0467a8fa3604a6b56e5540604ccc4968691d4fb7287069ee35dc8e146e69
126 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, many pointing to disposable domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external URLs suggest the primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/123?utm_term=how+do+you+check+transmission+fluid+levels PDF link annotation
    • http://fuvesozufinefi.medianewsonline.com/50077564430.pdfIn PDF document text
    • http://lonumawewexupo.22web.org/52014003989.pdfIn PDF document text
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/736ca05.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/bolexutibe.pdfIn PDF document text
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/ceb1e2.pdfIn PDF document text
    • http://gallery-shop.site/lecturas_de_reflexion_para_secundariazu8ex.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/ThgihE3/grand_crime_gangsta_mod_apk_unlimited_money.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/escuelas_contemporaneas_de_la_psicologia.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/4ghjd6I/41309138941.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/0hgPibC/arcade_family_chromecast_games_tv.pdfIn PDF document text
    • http://salestore.pro/fofiforikuvosubojesopu74os8.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/icZJjay/happy_go_lucky_movie_cast_name.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/giaCSjj/83608245347.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/wenoputelepunuremugu.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/dkgjihE/82807652722.pdfIn PDF document text
    • http://carbackseat.site/book_of_forbidden_knowledgez85ys.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/emqiPTn/23246381320.pdfIn PDF document text
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/viguvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/juzusizapeluli.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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 5540 bytes
SHA-256: 4d7767560abb547fe1bc7874a5dd7a05600146964d08a0e209966648fc312cce
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 11356 bytes
SHA-256: e412a4bd4986030cacee21f276db05180c35458a52ec001227a76b9a4ba6013e

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