Malicious PDF — malware analysis report

Static analysis result for SHA-256 b933b8793f1facc8…

MALICIOUS

PDF

80.4 KB Created: 2021-03-29 19:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aebbbda49d490ba8aad87d8f224f75cc SHA-1: 2228b3ec411c10b675c1ffedf6a5081fe2324674 SHA-256: b933b8793f1facc8e771cf72268a6b90717b9d232a5b0f48e79e0edacbfe1924
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/award?keyword=cechy+podzielno%25C5%259Bci+liczb+pdf PDF link annotation
    • https://bawokotofebadu.weebly.com/uploads/1/3/4/5/134507933/wopujagegovoxe.pdfIn PDF document text
    • https://ginamepi.weebly.com/uploads/1/3/6/0/136024017/viwukab-gipox.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/98759480592.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/putav_fogob_luzenol.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/e26f4.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/omron_hem-7113_automatic_blood_pressure_monitor_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_8ff9b8cb6e6d44deb0760deb4170a957.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_77305ea6cbc843cb804f3cd5ce43e714.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/35692471463.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_fbe13f98b9524467829a9ee2e1bca874.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_b37fb69461dd4e4b87325b4306506084.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/lol_ap_kai_sa_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/soccerway_app_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/life_in_pieces_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/principios_de_economa_gregory_mankiw_6_edicin_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/waxurebigivozeniriw.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/date_format_english_excel.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_77421d26073247869e8fc23bb6af767c.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_7527fd910f764a2396cdacbbfc8f66de.pdf?index=trueIn 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_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 5156 bytes
SHA-256: a88b481f4d0731f14dbb3d6536c2ca7aa01226b348362cf91708ff28b9331694
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 11668 bytes
SHA-256: 92a3165d1c6f9fde087618d04d9601077fcc49e98bb4e7499776835e1f4a6d84

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