Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab424a291b2f5be…

MALICIOUS

PDF

60.9 KB Created: 2021-01-09 23:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45bf5eac3a20835b54f02b19d1ba507d SHA-1: b1340afb778ccd6aeb755bbeddbf4871ede3c89f SHA-256: eab424a291b2f5be569d75613edec3db179b5f5bc4abc6cb61c8b13a75ef8cf2
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Crocs clogs size guide' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://traffking.ru/aws?utm_term=crocs+clogs+size+guide In PDF document text
    • https://site-1174515.mozfiles.com/files/1174515/27818840301.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/jigigareno.pdfIn PDF document text
    • https://site-1177897.mozfiles.com/files/1177897/60271084643.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/muvemasoxaji/63916402489.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/58533703946.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/classroom_activities_for_college_students.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/petubinojosivowapo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/xubikukesod.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/appliancepro_universal_air_conditioner_remote_manual.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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 4852 bytes
SHA-256: e12071b863f108bf971d865c7dfe82e744fa308070705aa80c24cdf3a4ad1827
font_01_sfnt_off0000c489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 9856 bytes
SHA-256: 7fdffc1cb550de2ed9b2cf67ca307deee75131f921b92b167585ff03922f6f60

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