Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e22d3d28679096…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 00:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 543aebb597c5c041bd0a994f5705b4eb SHA-1: ebc8cc739d8c310ad68e777807c305030cb97d85 SHA-256: e8e22d3d2867909613638c9209396a2ae5f55abfc572c7ad9558ff3c7bc4e86b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a potential lure for game cheats. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of many external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://allytemp.ru/uplcv?utm_term=world+chef+game+cheats PDF link annotation
    • http://mxagproducts.com/upload/browse/file/82492287009.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137fee5a7ab2---40586683759.pdfIn PDF document text
    • https://mlspoland.co/files/file/43081161064.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vosegofewopilarunarabij.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/bozuzivekaginub.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/demivomupolenafiketuwup.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/62617963296.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/95299234747.pdfIn PDF document text
    • https://kultmotor.hu/images/files/78674021421.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/xamijomasowobuxakegimegu.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/rowiriberotadobivolu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kabevurero.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109140635374008.pdfIn PDF document text
    • http://glassick.com/userfiles/file/wepivazaxizavir.pdfIn PDF document text
    • http://12shio5.com/contents/files/delamefofuniputuvimuwe.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/sakulepijufemuku.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/18865079676.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/pilutesi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210920214943_wg765g.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/30234651237.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/tuwebuje.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/kowelipipofami.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/350acc0fc07d4b0a0e577d5a9f8acf2a/fekavoxotogukegike.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/64714826559.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16324 bytes
SHA-256: 5583e949e71eb2ca48430193adde78fdbb918c02bf2ffee8a9c17a04558709f7
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10720 bytes
SHA-256: c611dad2e6259db48738f125cf57c889c086a01585d086442489666ad41b7e63

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