Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1abcade6900aeda…

MALICIOUS

PDF

74.9 KB Created: 2021-01-14 16:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5687484f168f539464186124ef7de509 SHA-1: 17b526301d8a0083d7c071e0e85f31854a6bb004 SHA-256: f1abcade6900aeda353a0cc626f8d432d0fa48107ac2fe323593c1132590e021
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a common technique for directing users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=tree+of+knowledge+of+good+and+evil+and+tree+of+life In PDF document text
    • https://site-1179526.mozfiles.com/files/1179526/26713791685.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/egjahbg/31974238823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5f8de437044da.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/ravens_steelers_score_history.pdfIn PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/ranesobi-kapedizek-welite-direwijapodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fd110e412696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ffdeb55baab7.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/86675548013.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/gateme/rabopezokozaxudegawutoli.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/wemogorabugaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/molibixesebudetunag.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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5060 bytes
SHA-256: 4961cbe6b77dba828c1b92a587fbc7d3c9154f3826934c0baee55d745bcc58ce
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 11916 bytes
SHA-256: 14163d6590a3e9fa5e2c7c004cf144eb5b77c23cd7465b395b560383f623b705

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