Malicious PDF — malware analysis report

Static analysis result for SHA-256 a973a7694af07dd4…

MALICIOUS

PDF

76.6 KB Created: 2020-12-23 05:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: eb8f7c915155efd2e4c25e97567cc472 SHA-1: e7c67f46c32a7188a8f6e8c73156159b7cb6e2d6 SHA-256: a973a7694af07dd4bd82a8b4b7e8f2c06859d33621337b23bc7df04521005894
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with at least two pointing to known malicious redirectors and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=sisters+thai+menu+potomac In PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/87905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fa6148bc8482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5fa30d5d887d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fae643ae3b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5fab2bc67ee49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491414/normal_5fc30052e8573.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/jagux/zivelositoxulalofifagefik.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/eagle_scout_rank_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/sf_36_scale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19923a3bf4b14abae1a5b/t/5fccac11920f47545b8fa572/1607248913699/glory_of_generals_2_how_to_get_mammoth.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37863f59a2572d8ffde5/t/5fdd8d6bf23a830a5996f0d6/1608355180151/rogers_anyplace_tv_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/resulafokefogadedawiruj.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/elliptic_curves_number_theory_and_cryptography.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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5244 bytes
SHA-256: 61e7f32fe5dd124a5e434e0931e2e23ac1f2eb31dfb8a118f8bdebab96db35d5
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 11632 bytes
SHA-256: 6d7c05008b6f993205796d32ac65f790213d39caaae302f66d3965c040084721

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