Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffa6dd5b642eae9…

MALICIOUS

PDF

83.1 KB Created: 2021-03-24 12:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37a23cd013d3fae2eb82c4d835e7e37 SHA-1: a061394676772768b8c6062b8a40e3435089f3fe SHA-256: 9ffa6dd5b642eae9dc35e3619020ac75041cc59ba73e83bd4c7056d36cf45c65
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The embedded content, though heavily obfuscated, suggests a lure related to 'Excited spongebob and patrick gif', likely intended to deceive users into visiting the malicious URL. The presence of PDF-specific heuristics and the nature of the URLs suggest a phishing or malware distribution attempt.

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://botokaw.ru/wix?keyword=excited+spongebob+and+patrick+gif
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fd85aa3c6c54.pdf
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/1699616.pdf
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/1785622.pdf
    • http://lixidavek.22web.org/94973303584.pdf
    • https://static.s123-cdn-static.com/uploads/4393019/normal_600418be23c72.pdf
    • https://static.s123-cdn-static.com/uploads/4419204/normal_5fdd3f246b0b2.pdf
    • http://doropunakas.iblogger.org/parrot_bluetooth_speakers_for_sale_at_game.pdf
    • http://mofadoludive.22web.org/hp_laserjet_pro_400_m401n_repair_manual.pdf
    • https://bevufivob.weebly.com/uploads/1/3/4/6/134669401/494ff305.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_9ff1a86f57234bd6be07c08a09460ebf.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_b35c38034e83497c83fff39673ffe9a1.pdf?index=true
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_3e76ca0d0cff4e1e97942a5790137c92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0feee5e8-386a-4dd7-b3cb-a2ce1fe944b7/how_to_do_f2l_method.pdf
    • http://zumewozuzetarun.epizy.com/strategic_culture_of_pakistan.pdf
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_1f05148c6c7e43ebb7cd6f52974ea20b.pdf?index=true
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_f7e9aa1a0a29443db984153117c25a33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/33992ec6-130d-430e-a043-ab280adc4bbf/canon_speedlite_600ex_ii-rt_transmitter.pdf
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_ee66915d36644ffbbe9076ddb3c1020c.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_904691417b8a4acfba01aea275430205.pdf?index=true
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_8eaed18666044fc790896f9fb7b337f1.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_2b6083a0d92244eebe0bc6e85ed17daa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4133429-b3ea-46aa-8e2c-8b68824a1d01/all_souls_book_deborah_harkness.pdf
    • https://uploads.strikinglycdn.com/files/f8bbd507-f595-44e1-a214-f8c9cbb6acef/mijurexir.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_off0001060d.bin
4e040657f0e9d7f1fa75bd176c71466ac7663f78c04094b66e8b2afe66ad0cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 5520 bytes
font_01_sfnt_off000118ea.bin
07eb025100746db2661148ed2e7b629da63a4d709c799036882316a467f97f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 11284 bytes

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