Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bff694437615c4…

MALICIOUS

PDF

69.1 KB Created: 2021-02-21 09:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 82048cd1464f020474cb3a021143ed48 SHA-1: ee1d9df3db3ca6f5e4749e27a0f525e852545a99 SHA-256: 89bff694437615c495d6c671c8aedaa697effeafecda0fdc581b369a0d3bde3e
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, potentially leveraging JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=zip+code+el+paso+tx+79936 In PDF document text
    • http://rerulekoba.66ghz.com/avivamento_adorao_central.pdfIn PDF document text
    • http://metuzupa.iblogger.org/bernina_v8_software_manual.pdfIn PDF document text
    • https://wojulifurezusek.weebly.com/uploads/1/3/1/4/131438898/pugajobekerupafi.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/napopapoz.pdfIn PDF document text
    • https://lowezikalazana.weebly.com/uploads/1/3/0/9/130969016/2152242.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/batame.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/pasakamitotizogu.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/norozovijalu/college_assignment_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/bsnl_cdr_crm_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/system_for_ophthalmic_dispensing.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/50476288711.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/adb_driver_installer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/scanner_canon_lide_300_fiche_technique.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/damupafimeboz.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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 5548 bytes
SHA-256: 2124b46f4b5f44fc44a2b7248ccd0473d2d9b2041ada734a6683338c9abb053b
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 12548 bytes
SHA-256: 292d43a37a1ac2fff85ff161144d503b72de34cadc43b84cc6f39ff9bd5cdcf6

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