Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8273375126ae30b…

MALICIOUS

PDF

80.9 KB Created: 2021-01-21 09:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f2142883bf2fe2d07f140c80aa42a71 SHA-1: e9b0908a53ce40a8bb67dec9afb7a40175aa18b3 SHA-256: a8273375126ae30bc54ff37ed2444f82fccd7299be36e40a697755f6473297d8
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly 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/wb?keyword=metrozone%20apartments%20anna%20nagar In PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/manual_de_megometro_fluke_1507.pdfIn PDF document text
    • https://site-1195739.mozfiles.com/files/1195739/oracle_sql_developer_sql_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_5fc90184aa150.pdfIn PDF document text
    • https://site-1212478.mozfiles.com/files/1212478/29450533642.pdfIn PDF document text
    • https://site-1174052.mozfiles.com/files/1174052/fidetiluj.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/sivarev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5fda39f0b23e0.pdfIn PDF document text
    • https://site-1182058.mozfiles.com/files/1182058/15250763578.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/puwigejigu.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/nefagolom/spaces_bed_sheets_online_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/sefugajomovesuzaso.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/chester_le_street_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/afmc_bsc_nursing_application_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/94025746350.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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 5160 bytes
SHA-256: 0e68f45b96fae6d6721e896ca35346fd94dd8bf7fdd9a9bf26fe4004b569b94b
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 15312 bytes
SHA-256: 9cd3bfad0e404849551cf6d4c050ff443ebbd68483e8d1c335d2c5608fbcce2c
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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