Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8bb663280b851f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 12:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3d841ac331034825c194dbae37f78a SHA-1: 195c4010c760da1db7f3db6ec28daf630692333c SHA-256: ae8bb663280b851f86463f3a18aae592b9354d5e972b102a7fc376b21dc0ea7f
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one primary link pointing to a website that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=apostila+concurso+auditor+fiscal+receita+federal+pdf
    • http://tojuvapemupo.mywebcommunity.org/68677301129.pdf
    • http://pufonorigaji.22web.org/dushman_film_video_song.pdf
    • http://bodipok.getenjoyment.net/34266252306.pdf
    • http://xuvaxujogilo.mygamesonline.org/caracara_plancus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_8f03cc8c7be442c095f6da93e34b901f.pdf?index=true
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_a18beb9579f0451ca043a8351f3f1492.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_cfb16a668c74454e90895e474f558313.pdf?index=true
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_bbdb83cd4d6a40f2846aa1a3dfa1d70b.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_c4e69ec6170f4aaeba1a947e65ac0edc.pdf?index=true
    • http://tuvufuxo.epizy.com/86445961421.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_9d53574ffa164d28bcbac061a3bf5737.pdf?index=true
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_4b4c0bf11c514d12979010c71a82d569.pdf?index=true
    • https://s3.amazonaws.com/lekezaru/70527291714.pdf
    • http://jusopetikikij.onlinewebshop.net/gawaloresomuzo.pdf
    • https://s3.amazonaws.com/paxivogedewilu/92029450558.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_438f5ba03f874c4a89ea8dddfa14d360.pdf?index=true
    • https://s3.amazonaws.com/befarekogol/72068333327.pdf
    • http://menasore.epizy.com/15595152423.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_22b401c7ce1a4410acb382080dc32fd2.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_ec9c0e30f5cf4c5b9f3af7310790f43d.pdf?index=true
    • https://s3.amazonaws.com/viregujipowuru/ereading_figurative_language_worksheet_1.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_4caaabaee660431e88b628c859b4dc0e.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_3414adea2f36456f83af1445963d51cf.pdf?index=true
    • https://s3.amazonaws.com/wixamupelinere/80389480470.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_off0000f29f.bin
84ce7a90a0cf933b1ef96207e6cbc9dd6fb601e2b3c817777d677dca5d634c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5140 bytes
font_01_sfnt_off0001042b.bin
c49055a79369ef154e2778654c303856feafcf998d1300b0d8b395f416554b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 13228 bytes

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