Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bff007c22e08617…

MALICIOUS

PDF

80.9 KB Created: 2021-03-25 09:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 44f3abbddf85e1c3350a5c1de972cc42 SHA-1: 9d51ccdcc65700eba58f6516b6066e1a9f80eaa7 SHA-256: 6bff007c22e0861713c3b4e2ca29f1bd3748f6e9d75ab8dfb4beabc0f0472fab
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=articles+paragraph+exercises+with+answers+pdf PDF link annotation
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/a64e4e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_603e60a5ae15f.pdfIn PDF document text
    • http://vanesifonemume.22web.org/badinerie_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5fdf70e57ad18.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/8110a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_602810ca4802c.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/e2c0ed67558a.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/8146328.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/50bfba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5ff8ede3b78a5.pdfIn PDF document text
    • http://polibesafonujof.iblogger.org/causal_inference_book.pdfIn PDF document text
    • http://pidoxabomekoju.iblogger.org/96878701491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/forupokisip/crock_pot_multi_cooker_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/havana_cuba_travel_guide.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_e8f15cf48ac6471a9b49e9577e4195a9.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_f87d64c38e47430995c6568ff29b7a3d.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_0a7298552871468eaec51819ddb69299.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_67807f9b49dd45738918ad38fc9d76e7.pdf?index=trueIn PDF document text
    • https://5dfb2dbd-6c80-4a99-afab-57dcddd938ef.filesusr.com/ugd/79d40d_e08975ed8d344dbf8d602803509b58a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timituvupame/tirozidulibokedopo.pdfIn PDF document text
    • http://befokube.rf.gd/aplicativo_de_baixar_musica_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/95579129464.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 5568 bytes
SHA-256: 5aca234d057a6c55812393f10684cd116359c613641055beaa0c6747ff6235e1
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10836 bytes
SHA-256: 9ea6ff2fef05abe1cbd87680a80df0f22c3b4030416cc2f4adaad371c35b6cb9