Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83580656118ea3…

MALICIOUS

PDF

69.1 KB Created: 2020-12-21 17:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ac1da20c694a3d1981fd8c133e1acd0b SHA-1: 719723134442bfb50673e868c541e1eaf90570a0 SHA-256: 5b83580656118ea30072c16866323c088c1d06291d6538bb6891191fd3e65e09
234 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL and the document's structure suggest a phishing or malware distribution attempt, masquerading as a bursary application form. The presence of numerous external links, many pointing to S3 buckets, indicates a link farm designed to obscure the ultimate malicious destination.

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://ggtraff.ru/aws?utm_term=lonmin+bursary+application+form+2020+pdf In PDF document text
    • https://gedolumu.weebly.com/uploads/1/3/4/7/134761272/47931.pdfIn PDF document text
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/5347446.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/d5e68631ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fbb69fb4bc95.pdfIn PDF document text
    • https://wavafebezed.weebly.com/uploads/1/3/4/5/134527209/3653284.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/4716443.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/wekexakanojenixavat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f9726133bb57.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/9333335.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/mefadedosuw/puludiwovobibutaxerig.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/anti_terrorism_act_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/kumigenesa.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/severe_asthma_attack_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/55907370032.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/backup_android_to_mac.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_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 5756 bytes
SHA-256: 58580da0654c11d2a184dd23c23ba4f46c46fefa6d6b157008456bc81856d514
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10772 bytes
SHA-256: 668e3280e6dc905ef2b09dadd4cba66a805ace1352536727a4b09045951431cf

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