Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbd4ee0d8afb6ea…

MALICIOUS

PDF

74.9 KB Created: 2021-01-05 20:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b50e56c1248e55bf4c954b7306dda899 SHA-1: d4db2a0ca296e19160c7e98bcb28f4f59ea0ef6b SHA-256: 7bbd4ee0d8afb6eafe34cc6cd72a67be6178c1f38003dd20afc0a4a2a7a9e957
214 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its inclusion of numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Celtic harp sheet music free'. The primary malicious activity observed is the redirection of users to potentially harmful sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection further support the malicious verdict.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=celtic+harp+sheet+music+free In PDF document text
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/a597928410ec4.pdfIn PDF document text
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/pibogu.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/7fcb2ae630c3776.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/vokusuminimozuwaru.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/tokejuxapapepebilowi.pdfIn PDF document text
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/9658348.pdfIn PDF document text
    • https://fimibiwuru.weebly.com/uploads/1/3/2/6/132696060/a1e4521.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/7825802.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/jokotaziweluge/91714146336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aacece-167e-4f32-8942-3911e0b62e57/chris_watts_second_confession_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/epididymitis_orchitis_chronic.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/49714251157.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/weather_report_shahkot_jalandhar_punjab_india.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/sabezubijebidebokari.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
    • 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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5160 bytes
SHA-256: dec61a00135e09dcff77d52f4a7350c792141f5e252f4156f9d80a3fe3fd4c66
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 11408 bytes
SHA-256: 5193ee4ccd4d9409db530239012e039ebea6a2368d63d1bd7666cdb24ece9de5
font_02_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208

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