Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1d442d3dcac2d…

MALICIOUS

PDF

72.7 KB Created: 2021-01-10 11:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 95b35ac2783f4134cc4fd64b1beb50f4 SHA-1: 23c3e00051da1c06571ba584ef9e182718f2bbd0 SHA-256: dcd1d442d3dcac2debb18eed4150b7eaf1c1fb8672f55313ea851bf15bb55c74
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

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://gettraff.ru/123?utm_term=stick+men+madness In PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/mp3_ringtone_cutter_download_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5fc38016265a1.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/fuzaxobes_wabixofim_xatul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5f92fe3003287.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/8732515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e972cdcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5fcdf38db6dca.pdfIn PDF document text
    • https://site-1168145.mozfiles.com/files/1168145/galaxy_games_free_download_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379854/normal_5fe13df5a9ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fd79521558c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f89b853cd6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f9a5a7ff0001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f8c1ac54acdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sojaxub/legozabeporux.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/jebas.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/understanding_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/litafikadige.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 4800 bytes
SHA-256: 103cd8233cdac1c1081062c338d572403efaaba633a0b9ff36bb5d80ca8370f1
font_01_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 10320 bytes
SHA-256: 068ed7933bd0c375cf8c498a5b8b298998a8911207da126a9558810ca7fab021
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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