Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ccbd949cbf9366…

MALICIOUS

PDF

67.4 KB Created: 2020-12-13 17:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eae26612e164a363c635af8304fd865c SHA-1: aba376b729b607b9de3e6759c146bddbcce8fda5 SHA-256: 67ccbd949cbf9366dc5108ddb565f5c30753a28334124c640cdc52662de362f9
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to 'traffic school' and 'wkhtmltopdf', suggesting a lure to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://traffking.ru/123?utm_term=i+love+traffic+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fa11a7dd1e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_5fb703bd285bf.pdfIn PDF document text
    • https://pamemigewoguvo.weebly.com/uploads/1/3/4/4/134438925/3996160.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/zibenoroduzuw/bakkhali_weather_report.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc1a9027acac6192aff6712/1606527235136/codehs_ap_computer_science_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53481c30a162e0c6eae90/t/5fc6b3bb64571256542a20d0/1606857659871/76137711370.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5adf5be9b6939512b78e3/t/5fc6737c1972c46e3c7ce27c/1606841212479/latest_bollywood_romantic_songs_2019_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd109560d46713400584b3/1606226071871/961490844.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e92c12facd59cead07a1/t/5fcb78d511c29807e6d9ba59/1607170262313/best_buy_near_me_apple_laptop.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_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 4968 bytes
SHA-256: cd31158cd2b90908a5720d637d366cab3868ff7c595955ac5d5882e95687d055
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10276 bytes
SHA-256: 10ee973b35675e28f2500ed246615cff46b69f366495a5ecee99214c5978054a

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