Malicious PDF — malware analysis report

Static analysis result for SHA-256 00527f717656698c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 12:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3a798ee8d1573d075bf9db033cba7bb SHA-1: 96d51fc6126fe7a09ead9c009eaf62d066c062d1 SHA-256: 00527f717656698c7df1368ca00dca912d9a8a9beb1b9c3876501aa43faa4cb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the link farm heuristic suggest an attempt to redirect users to potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nyirfa.hu/uploads/files/fizekodesijafewoxe.pdf In PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40592729877.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/rizonuxedonifafevariwovi.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/63473082313.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/putelamamika.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/83813436813.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/26406468568.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/96642358431.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/97680182933.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kixogipalub.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/28173180355.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/dugadopas.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a46d3cb652---josawewivigozamizu.pdfIn PDF document text
    • http://zl369.net/userfiles/file/58419050943.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/79080600851.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908225845367929.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/wedibetejutafamavimajerat.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/24359448717.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/zegojix.pdfIn PDF document text
    • http://yongqingtech.com/d/files/13965197372.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/91104294899.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lulusivovanilubilobapi.pdfIn PDF document text
    • http://mrybalko.ru/files/ximenovoxeruw.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/mofamamijin.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/46402586237.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c08d6c49a8698417a63e7cb2d8d6e4ba/65788503972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=after+we+collided+online+watch+freePDF link annotation
    • 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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 10472 bytes
SHA-256: eafc168cfbb56adfa1c5d0a0b663212a98c1ce02c4281ca97e32a449629111f0
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 19564 bytes
SHA-256: 12734fae0f9aaa90bb7cb4c3ad0868cfc7071a218a96af6aa54fce1796406d81
font_02_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1