Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c6e4851dc60e0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-06 02:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d02ce26c88b3018d50536c52384c7886 SHA-1: 753ba0bc68a50eb9a9b8ac01ab9419e02b06e72e SHA-256: da2c6e4851dc60e0067f42bd8dab13341a733637feafb655f943b0146457e7b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The primary malicious URL identified is https://resalured.ru/strik, which is likely used to host a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=arduino+nano+33+ble+sense+accelerometer PDF link annotation
    • https://cdn.sqhk.co/mojupesonon/jRRhian/the_third_day_hbo_imdb.pdfIn PDF document text
    • http://insurancesouk.com/8014929858o4kyg.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/Wgfrhcm/online_shopping_websites_usa_clothes.pdfIn PDF document text
    • http://reform-st.ru/nora_roberts_the_awakening_book_1swhf4.pdfIn PDF document text
    • http://lami-lashes.site/equifax_canada_credit_report_and_scorecohne.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/UkhhFej/bulapi.pdfIn PDF document text
    • http://idem-peshkom.ru/lista_de_verbos_en_pasado_simple_en_ingles8ktco.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/bNgjmvS/disamozesojasedaj.pdfIn PDF document text
    • http://mikrotikwizard.com/lorutapaniximo8b2il.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/VNicWcT/csr_racing_2_pc_car_list.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jBhagcx/easy_chocolate_cake_recipe_no_baking_powder.pdfIn PDF document text
    • http://20970907.net/lemuramasegapa51dbt.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/iihbQvO/45720997073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_1371e430444447d5bdad7498edec8966.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/xasuloxinorewagokomefada.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/customs_law_manual_2015-_16.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_f4f544cd5c6e4d4d867f85337b862b6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/43213318312.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_3a5e1235135d4d0da9099371f36b0bee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/fire_extinguisher_inspection_form_template.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_66e6ab04c6f947b2b509c505be690ea7.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_11fb634046254aa9984249de1b3687a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/bird_calls_app_free_for_android.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 5376 bytes
SHA-256: edfca3c69a95661272e2fbd5bae01935d92860e586edd0dbd83ed47f95301d43
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 11116 bytes
SHA-256: a3ee0ddbc6055c9a8eaf2442260403e2e29bf5e7d50021a8687768f8a357de36