Malicious PDF — malware analysis report

Static analysis result for SHA-256 1047d8a5075455c5…

MALICIOUS

PDF

72.6 KB Created: 2021-03-19 23:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0f1b6f15e6f4a7a8f9ab317dcc38e293 SHA-1: 1235dae7f0a05cb82d39930f9e9ec881d097fd58 SHA-256: 1047d8a5075455c58b6f00cfd502212be3a68cbdd92f501a2f23cd358943bd51
126 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external URLs, many of which point to disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs suggests an attempt to redirect the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit user interaction through link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://resalured.ru/strik?utm_term=how+to+check+your+computer+specs+for+gaming PDF link annotation
    • https://cdn.sqhk.co/popaxutu/hfgjhgq/roxubujagogupogirup.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/Kgf7gjC/android_system_webview_download_pending.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Y6ibhhE/dukuliwunaxat.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/wnxifia/freaky_love_stickers_for_snapchat.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/jmQpdd6/personal_statement_template_for_medical_school.pdfIn PDF document text
    • http://cardioactiveitalia.site/warusoduxugarusatzum0.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/kdrJ5Zu/4067656503.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/igigfid/nuts_and_bolts_recipe_with_curry_powder.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/228713d5b.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/vejomur.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/3654145584.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/878709909.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/hheluZa/51245658170.pdfIn PDF document text
    • https://zerorobasajegi.weebly.com/uploads/1/3/4/7/134751736/be30d667.pdfIn PDF document text
    • http://storeyou.store/netgear_wnr2000_specsqprw8.pdfIn PDF document text
    • http://blablablacar.online/oracle_sql_select_string_functionsevkia.pdfIn PDF document text
    • http://detonic-ro.website/pelekovutopagor9v9wg.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/B3Wgghe/98156395193.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/30665174098.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/bidokojujibosewaza.pdfIn PDF document text
    • http://sparzha.club/wigabiwojowuzamafalat5rqjz.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/62273e26-156b-4883-8462-cd9a254535f4/wininukepatiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea863c3-9329-4cc8-9b3c-76a8e46ca72d/roku_xd_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79ef905-ea83-4523-85b8-33afefb932d9/elm327_bluetooth_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383fc393-bb25-4135-b2d2-046c26d01eca/70885645238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b8ad83-cce8-488e-bf22-115cda390105/how_many_calories_in_a_sonic_cake_batter_shake.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/lease_agreement_termination_notice.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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 5616 bytes
SHA-256: fbfc5a481c0fe1c2a98ac2c2139fe8c7c8203d00ee67beae9a1f1244951501fa
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 10120 bytes
SHA-256: 17649447733bb3b8f9966f9c33473f94f74f3005cd56e50346ac8ec94b039585