Malicious PDF — malware analysis report

Static analysis result for SHA-256 18697ba13e9c353d…

MALICIOUS

PDF

84.8 KB Created: 2021-06-05 05:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68626bf3dce1e02db4e1a55eea793535 SHA-1: ee3c36e98b3606fbf19d07ace228489f1624c8ab SHA-256: 18697ba13e9c353dbdf368e78f4c5146287575ad6ac2ab6bb888a65a69e2168c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=how+to+do+a+back+handspring+on+an+air+track
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/veroxekazerudig-tifazopave.pdf
    • https://cdn-cms.f-static.net/uploads/4371013/normal_60614ff7a5f58.pdf
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5fcdff1fd8278.pdf
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5feb495029567.pdf
    • https://cdn-cms.f-static.net/uploads/4409257/normal_60374f55e8aa6.pdf
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/falaramapobafib.pdf
    • https://verobegami.weebly.com/uploads/1/3/0/8/130814611/9443503.pdf
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fda4be91521a.pdf
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/7b55f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/466234bc-12d7-40f3-9791-4e9957df390a/the_raven_movie_netflix.pdf
    • http://fajopab.pbworks.com/f/software_testing_interview_questions_and_answers_download.pdf
    • http://mejigulo.pbworks.com/f/quando_prendere_il_magnesio.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144516363/what_is_the_gothic_architecture.pdf
    • https://uploads.strikinglycdn.com/files/82d4b946-8fdf-4534-b2d0-3fae2c896dca/davebaxekenakifa.pdf
    • https://uploads.strikinglycdn.com/files/378ba359-3616-4cec-9d53-fcfb3f41fb31/kepoj.pdf
    • https://uploads.strikinglycdn.com/files/b4d6d98e-4bab-495e-9e34-dac078974ff2/dbx_166xl_manual_espaol.pdf
    • http://foxobekizax.pbworks.com/f/rigodamaroli.pdf
    • https://uploads.strikinglycdn.com/files/1c82b769-fcb8-4d71-8411-95be9aa61ab3/what_are_the_themes_of_she_stoops_to_conquer.pdf
    • https://uploads.strikinglycdn.com/files/debb49cb-25d1-4844-aea2-0358910d4c02/automatic_double_sided_printing_option_in_word_has_disappeared.pdf
    • https://uploads.strikinglycdn.com/files/9c0256f8-e8c3-43ff-b18f-6048e526e786/how_to_make_pizza_ranch_sauce.pdf
    • https://uploads.strikinglycdn.com/files/4b414ab6-8db3-4981-af62-14155772a4dd/how_to_run_diagnostics_on_kenmore_elite_washer.pdf
    • https://uploads.strikinglycdn.com/files/e6321e6b-2b0d-45d7-a1e8-738d70c48863/66717409032.pdf
    • https://uploads.strikinglycdn.com/files/b90eeed1-80c1-4bf1-b06b-3734fbf44f59/niwemara.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a20.bin
feaf0c70d5955a378b6b0c333391e540684a3195255277719f0e11409579c10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 5560 bytes
font_01_sfnt_off00011d0c.bin
d01fd84f3c24884a3dcaff3cc711b83fc1f739538ba14d4a7a2f6be5572fc0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 11548 bytes

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