Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ef0fa6eab9b01a…

MALICIOUS

PDF

64.9 KB Created: 2020-12-20 05:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a27092ff8248dfc0982bb6ab5d53d887 SHA-1: 5392e09c4dd37f09b42dddb9fd3e2c1fb308248e SHA-256: c8ef0fa6eab9b01aec49ea43023e12406b7f6cb4bf7b37a0c38cfb1e731655fe
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to registration and download, aligning with a phishing or scam lure. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=divx+vod+code+registreren In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fa696ddf1473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5faac32ca1290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_5fbdc5cc9c890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_5fa77cbdd0fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8728fe9b08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fb5e356aac3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fb37e1e2b0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fb3f90cb4a3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2b6d9e2fce462bc97aa53/t/5fd20cc89a9e5443ac80a88c/1607601353805/outdoor_tabletop_fountain_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28eaf9698b02c7f2b2aca/t/5fcc1aea5177ea328cb129b4/1607211755395/kokatagifulilovelakeva.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e1c227a199023ac2594c/t/5fce3570662d5e24e0cd8480/1607349617499/wosafivifajeraloziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9019742b-ebfb-41fa-9563-cf5dca4654b0/2019_ap_test_dates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fc6d7552ac13f1ee9a8e675/1606866775501/ice_cream._cake_near_me.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 4992 bytes
SHA-256: 8f5cde3e108af36680aafef605cb6badbf31ce0a8c54e9f6b4b53bd84bba3266
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10748 bytes
SHA-256: bcd7dd23dd8bc22258c6e9f56164d0d94f9271ea443b42d41e089c3db774eb05

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