Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfb39a7e7adebc6…

MALICIOUS

PDF

73.2 KB Created: 2021-04-03 19:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c075fd7030ff80aa078f5bfbe5d63e87 SHA-1: 2c5d202cea8b6b23d78572b40f2064ca32454763 SHA-256: ccfb39a7e7adebc6377a996bc4a7cf094ea7dd06a8cc59bf18239ddf7d61edc2
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links, suggesting a malicious intent to redirect users to potentially harmful sites. The embedded URL 'https://mezovuduw.ru/wix?keyword=programas+de+aplicacion+ejemplos' further supports this, as it appears to be a keyword-driven redirection. No scripts were extracted, but the overall structure and link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=programas+de+aplicacion+ejemplos
    • https://gulegeletemewux.weebly.com/uploads/1/3/0/7/130738758/1983578.pdf
    • http://sale50.pro/gesuvizuvikapewerixariryu3x.pdf
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/3821884.pdf
    • http://farijizibeke.iblogger.org/72191002905.pdf
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/rafexemoda_dumowanisasup_zopesipala.pdf
    • http://medyayazilimtr.com/mudimogidezibo6ik.pdf
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/tunokezefedilazi.pdf
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/431bed5c70.pdf
    • https://cdn.sqhk.co/xavexapoxiv/Eiegihb/ponidisuduna.pdf
    • https://cdn.sqhk.co/tomibigi/cibiejQ/70280395665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_73166c6464c24060be0263096df7d519.pdf?index=true
    • http://gujimimokogofe.rf.gd/migoviwaju.pdf
    • https://s3.amazonaws.com/nunakixuma/apps_to_listen_to_music_for_free_offline.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_424daffde3a34aef9450421042d95cfc.pdf?index=true
    • https://s3.amazonaws.com/mogipegi/78005383404.pdf
    • https://s3.amazonaws.com/pulujolatepuv/greenworks_40v_chainsaw_manual.pdf
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_2062ddd5c87742a79c556afc6897b0a5.pdf?index=true
    • 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_off0000de09.bin
22887a7247200c25471941d9449b406a4ae93fc143651e398c2ec42aaf59e29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 5472 bytes
font_01_sfnt_off0000f08c.bin
cf6419a20cb815f825b0fc07d54239100b12ba58d564abbe8e1b3c9583509383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 11628 bytes

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