Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e7b661fcbaa18…

MALICIOUS

PDF

69.4 KB Created: 2021-05-20 05:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a32904e90428a215940777b70944b683 SHA-1: 7c18c89c2b1865d5fd76c9ff8dfe505df1943968 SHA-256: f61e7b661fcbaa184d9ea40a260c3ee8a87080f952f53b36fcbf3cff8c1a6639
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or scam campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=perm%25C3%25BCtasyon+kombinasyon+olas%25C4%25B1l%25C4%25B1k+sorular+pdf PDF link annotation
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/0c933c15f.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/f2a2dc1c977e6.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/4628492.pdfIn PDF document text
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/xefezofewal.pdfIn PDF document text
    • https://xiwikufebalub.weebly.com/uploads/1/3/1/4/131438050/805ceea4678a8.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/tovadufizeposaxobox.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/regugit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f98ce4-78e3-402d-8c7e-62d00e6ec2ce/23839463200.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/14985101341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f77819-b601-4665-9b32-a26e76d0fee4/golovutokepukug.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/47495440817.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/general_employment_reference_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/judarasuvaxagelodimurof.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/tropic_of_cancer_map_india.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/mapa_de_riesgos_sst_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bc49f9-9298-443d-b604-8ae82708743e/xunumurufeku.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/floating_notification_android_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf70e79a-54f8-4b5f-9970-520bcfcafcdb/dyson_dc58_battery_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/666203239.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/naming_polyhedrons_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/monogram_fonts_embroidery_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/42104337918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3037a867-4c62-4c53-85bc-742b509eb6bc/wabejijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/gmat_reading_comprehension_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/st_nicholas_chantry_school_uniform.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 5644 bytes
SHA-256: fb87128c02c7c0d6bb86b3e32bb18c88c64da9eb12a1816ee7c949740a19dd30
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 9816 bytes
SHA-256: 9fe3ded967f73497d6b75e3a05eb712634cba06f8290f98cff7abf2b39698150

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