Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ea7dfe5e683eb7…

MALICIOUS

PDF

71.0 KB Created: 2021-03-07 14:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 92d89e059bcbfe42d121a416f9d6d080 SHA-1: fd24bf1ea3974d8cb9bb3d655cfde9edfedf70b0 SHA-256: 28ea7dfe5e683eb7af32e2685f6e7e26f35fa6da319a29882191c12bb45c6128
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('leonvi.ru' and 'erse.xyz'), suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=standards+of+perfection+rabbits PDF link annotation
    • http://erse.xyz/5400491265tx4jz.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/hihj4YQ/spiritfarer_switch_physical.pdfIn PDF document text
    • http://ens-pictures.ru/wagapesirovz0xed.pdfIn PDF document text
    • http://mirror-x.org/literary_criticism_an_introduction_to_theory_and_practice_free_downloaduj324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fe72459f1c49.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/Xj9gdh5/dotifukunubejem.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/cjgHAge/51684073803.pdfIn PDF document text
    • http://baltika-trans.com/gta_4_apk_download_without_verificationhnvcn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5ff05fb4b383f.pdfIn PDF document text
    • https://cdn.sqhk.co/biwufudi/gcifWjj/kodore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_602354dbafcfa.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/ed3d4ab9-d3bb-4619-86a0-f37ce828463f/harry_potter_illustrated_3_book_set.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/cheap_used_android_phones_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90563fc-8e63-4819-b80c-ff93ea9b993d/sulafiti.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/5282343014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7bd334-d65e-4880-a37d-8a84ad8c5346/roman_numbers_1_to_8000.pdfIn PDF document text
    • http://kiganume.epizy.com/how_many_amps_does_a_120v_contactor_coil_draw.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/see_s_candy_assorted_chocolate_box_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/sebofaberazevu.pdfIn PDF document text
    • http://bekelogamaju.rf.gd/asking_questions_about_cultural_anthropology_a_concise_introduction_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c518fbe-45a6-4776-936b-757c74470998/adobe_photoshop_cs5_crack_free_download_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/39083880417.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 5360 bytes
SHA-256: d7a6c2cfcd1fbefb2fbfe2d786e9f1849f7dcfbc13115c540ee86988c43aed81
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 10624 bytes
SHA-256: b835c5ad006d69786f3783195e9ffc53d4aeed53a968a32ba50e8d08a39bae26

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