Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb95de45370329df…

MALICIOUS

PDF

69.3 KB Created: 2020-12-03 00:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b1b889c7002eaadd38e374ff2c1687c8 SHA-1: e758babc6f780ae141b1cb8fafc8f99e7ee4f9d1 SHA-256: cb95de45370329df9283a8eaffd1c373ff229f50e41a42fc8681b479d0f1e953
234 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many of which point to 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 metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=algebra+and+trigonometry+10th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5fb5d3f5a6fcf.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/nizemizejalisu.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/2511602.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/e5f1b7ed3e7422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fbb7ec8744b1.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/fizutigeb.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/b3b43cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f8ef9638c235.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/d98ad1c1-ef2e-48c4-830a-7b2db4901248/3317309161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968ca5e5-0673-48b7-b71f-501d63508838/20218508218.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_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 5484 bytes
SHA-256: 24aec87ec190857dfecebfeecb3fcb0ea07d28511408236cb99a83b0fb06ee22
font_01_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 14628 bytes
SHA-256: 9971f8f5f29a3718386be277ac86bd134019e35337963cacbb286fe7ffc496e1

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