Malicious PDF — malware analysis report

Static analysis result for SHA-256 33be14a087a2c340…

MALICIOUS

PDF

90.7 KB Created: 2020-12-15 13:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ed288f144acdeb1809cd82424cb2dc23 SHA-1: 42b56ee868594c237aaf92bdf90a1e5e0bec58dd SHA-256: 33be14a087a2c34099a276e20a989314c156fbcc07561f5b20d380b7fc6557b6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to technical documentation, likely as a lure. The primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=cisco+xr+bgp+configuration+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5f8db39c1cc96.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/nurilamozudali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fce8739fa5b2f3cbf309069/1607370557400/hornblower_series_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/indianapolis_hourly_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/vegetti_spiralizer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/aircard_790s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/digoxisufisumumu.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/xobarabowesegos.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/agility_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/79704904993.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/costing_worksheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/alif_novel_episode_3_complete_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/adana_demirspor_yeni_sezon_formalar_2018.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012a84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A84 28332 bytes
SHA-256: 58bf31d5a65c6faf885adada139688e50b0c8313dedb16e6eba41b7a0349842c
font_00_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5404 bytes
SHA-256: 541f2d251bbade55972715d7049e779b1b4f49efb643b3dfd1fe487db0afe60c
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10436 bytes
SHA-256: 04fb4ffacc8c48dd977e455d65d4851d69112baa11e20da3766ef3bfe18950f7

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