Malicious PDF — malware analysis report

Static analysis result for SHA-256 380b6328f4a40170…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 07:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 21a580629b2ab3c5fd9e8b85e11c2859 SHA-1: 73d0f311473b9e6afbc8dd9326a415c9dd481d4f SHA-256: 380b6328f4a40170e7c36a5dc6fa9c7120b51c0db1d2f0616f2797d82db166d7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains strings related to product pricing and application details, suggesting a lure for phishing or malware delivery. No scripts were extracted, but the presence of malicious links is a strong indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=asus+mx279h+price+philippines In PDF document text
    • http://rebibedo.mywebcommunity.org/fujuk.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/belajar_vlookup_dan_hlookup_excel_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5fcdad680bde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_604a403710708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fe80bfa39347.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/lotab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fd356d0513f9.pdfIn PDF document text
    • http://ributufukepun.66ghz.com/spanish_grammar_exercises_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_6008430021329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/tabla_pulgadas_a_centimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/commandos_2_full_free.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/will_you_come_and_follow_me_piano_sheet_music.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_df9614e2bbcb400f8569b3274653d3bc.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/70965531349.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/which_victoria_secret_model_has_the_best_body.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_0cbd012a4b494e20a8a5c2b07b0cbf3c.pdf?index=trueIn PDF document text
    • http://pamapezule.rf.gd/doro_mobile_for_seniors.pdfIn PDF document text
    • http://wanukunu.epizy.com/nfl_power_rankings_week_11_bleacher_report.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_9843b0591aee490d9e4f81da8d884a0a.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_6c4b409085064727a87b2c579b9ce78b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaloto/terraform_azure_kubernetes_version.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_65546d0276d04b50abd7c781fe856b94.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_1e887fd0b7274e78aacd886136b46a17.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_29b9e692adc8482baa7ff7c6c30ba7c9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 3028 bytes
SHA-256: 1344297ac3eee8681cffc03e9d761b2735618db301dc60d380d883d09a86db30
font_01_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5388 bytes
SHA-256: 31d71e2246a65d52b61baa2ae595266275979f211e16de603bae793820f1888e
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 11620 bytes
SHA-256: 7feb2c1cc8b2c01c911a98f42862860341610f46dfaec47a8438d5ca4d93efcd
font_03_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16104 bytes
SHA-256: 3a8a419db3e9aedd1ef36abb7ea956935ca5c31c3589d4fb5419bf391c7577d6

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