Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81880d23fb71226…

MALICIOUS

PDF

68.2 KB Created: 2020-11-11 23:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31105fbedadc4b1f381c14d40c96d660 SHA-1: de41585a14b720a043feb0431ded8d9504f5d828 SHA-256: f81880d23fb712260c20b96ce7447c868fdd7829a80e147bd19abbd3446ef4bd
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=numeros+romanos+en+word In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5f9ff93f59821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5fabaebd49568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f874304549d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f91aaab7cebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f9645e425202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f874e4670a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f91bd5e94c4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8be31f-8e41-4353-8445-9963b27e513d/how_to_get_retrofit_azur_lane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d23b231-e000-4e0a-bb3b-30e7f733bce0/46363149760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf162227-32c3-4999-93a6-320cc01c93e4/99532623744.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/elton_john_net_worth.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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 5000 bytes
SHA-256: f8e8a9a1e47ca90bc2b893c4316c282bdc7882592927ddd7152a98e6dc82035d
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 11420 bytes
SHA-256: a67a078b830577de2689b753694ed15a3bab4ca0a44bdbcfffbf4d7b62887e6e