Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65759de349e666a…

MALICIOUS

PDF

106.6 KB Created: 2021-03-10 17:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 44eeae8e6914d56af283e91e82434e3a SHA-1: f62d6c1b0eb18d8b10d1251c72ff0509cfd71365 SHA-256: c65759de349e666ab307503887d3447d7ea7e123de69e7f1368d810d4991c239
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to 'digital electronics fundamental concepts'. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/award?keyword=digital+electronics+fundamental+concepts+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373240/normal_600de92656a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_601876b9aaedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_602f8f5c43737.pdfIn PDF document text
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/neronelono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_601aac8ab9dc8.pdfIn PDF document text
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/sizazowita.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/kununako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_60387c3552333.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/3896434.pdfIn PDF document text
    • https://nogojajefe.weebly.com/uploads/1/3/5/3/135314992/tivazasitamumed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fda5cc96658f.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/abff43f1-466a-487c-bd03-60a450f1ab4d/r_programming_language_tutorial_online.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_5723aafcb4304a578b0dbdd4aa9bb8aa.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_3395bd8bddd4408f9e2065f7b1bcb310.pdf?index=trueIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_da054758261a468b8f4954cd64100d09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad45d83-3836-4a0f-934f-1969ab957d17/download_game_adventure_escape_space_crisis_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf63e5c-e798-4267-a08e-2fe95d96622f/vuralapimef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36059aeb-946b-4228-8f3f-2b50afccb42f/wii_console_2020_best_buy.pdfIn PDF document text
    • http://xafinoligu.epizy.com/global_demography_in_contemporary_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a92932-20fa-4001-8ecc-9a2ab38d5eb0/did_brandy_norwood_get_married.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_0afe0033cf5c40028a15c2216874137f.pdf?index=trueIn PDF document text
    • http://nupituf.epizy.com/tadifebuvesidaxumozok.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_03b6b48d84a14607a7e3cde0c3e1deae.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 5476 bytes
SHA-256: c4acfaa2587310ae3f9f9b8148870017ab62849d04f9e6efbe00cf63c9e8f8a1
font_01_sfnt_off000176b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B6 11116 bytes
SHA-256: 31ad15f6b64bc42f60434341d11c176d240fc8e3d50ec054386491dbc6385cb8

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