Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2f5b5268d09872…

MALICIOUS

PDF

68.1 KB Created: 2020-12-07 00:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ddda5122099f350844a4aab564df3bc SHA-1: 187515a9e82ecead51335c45b5ceef227b6fb4d2 SHA-256: 3f2f5b5268d0987201641e798d59c1849a1825c0ade618f7b5601b5e4f0309fd
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=r+descriptive+statistics+by+group In PDF document text
    • https://laputamobo.weebly.com/uploads/1/3/4/7/134763437/809764cf.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.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/f174e5c5-2c91-41f6-9302-23e06d4431d0/iba_caminando_cuento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0b4253-0bad-44cf-b94a-006a20c33741/sims_4_edit_in_cas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3991de-73d8-485a-bee1-fa9c6e11c92c/razasirag.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/rixenaveviwunaroxogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c516b6-bea4-4bdf-b954-ac3722b72e86/nubovopub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5306ac14dfd36fe0d8a55/t/5fca0bf72e4d7f67ca30d6a6/1607076858155/vaporlive_vaporwave_aesthetics_live_wallpapers.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/two_step_equations_with_fractions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/bhai_dooj_2019_pics.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_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 5520 bytes
SHA-256: bfb973fb9ca46fd0149511c3ca2f6a6e9aed1ce9cba4dd2a228dfa1b7e1d510a
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 11820 bytes
SHA-256: 639f34929f4bbfe5a6a43ef06331d7fd8ab1999991f87965215e66a9955f853b

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