Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c8e34ba48b73fe…

MALICIOUS

PDF

72.4 KB Created: 2021-03-13 20:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3f677a97427d20bb847e4f97ca255a44 SHA-1: c083172cfdd0f039032848ff8204131f8c704898 SHA-256: e5c8e34ba48b73feecd68a39d9aab29c0c9425af9b8040fd2d1cc1d6b3804c20
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, with a primary suspicious URL being https://gimoguvi.ru/123?utm_term=macroeconomics+a+european+perspective+blanchard+pdf. The PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=macroeconomics+a+european+perspective+blanchard+pdf PDF link annotation
    • http://vipmanmarket.space/induction_of_labour_guidelines_pptj1ake.pdfIn PDF document text
    • http://pss77.ru/nikon_coolpix_s9700_user_manualtteew.pdfIn PDF document text
    • http://oyuncuxx.com/holt_science_spectrum_physical_science_textbookmk7js.pdfIn PDF document text
    • http://usacreditcheck.info/rumi_books_hindijzjhy.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/convert_from_to_word_document_online.pdfIn PDF document text
    • http://idealicacolumbia.site/log_dining_table_animal_crossing_new_horizonsbbh4b.pdfIn PDF document text
    • http://prequester.online/tusarolomezarokd37a.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/06e55322-b5ea-4be6-ba85-6c200c6dacab/sogok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f15ff42-2c2a-47d2-8e43-a43f5ebf5ec2/reinhold_ludwig_and_gene_bogdanov_rf_circuit_design_theory_and_applications.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_f223e3dfb17b4291925d61c289ccaf25.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_306a9c03e3df4a9d9c3b298de77ec321.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_9fb2d692129b4aac9f778b4df4a69dc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/649807a6-f121-436e-8107-88ee811b744a/tipos_de_instrumentos_de_medicin_o_recoleccin_de_datos_cuantitativos.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/multipart_form-_data_vs_json.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/10247733672.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/how_to_program_the_clicker_garage_door_opener.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 5600 bytes
SHA-256: ffa6f092a8903e2ed2528aeb5bc3d6c06a6697f417da2374596c9c41a0ace038
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 11084 bytes
SHA-256: 671ad24c899508eed355431fd138a387ebf03fccd4b71803fb9c57d9eb61260a

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