Malicious PDF — malware analysis report

Static analysis result for SHA-256 9766ed519d05c71b…

MALICIOUS

PDF

63.2 KB Created: 2020-12-18 18:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7f6c347569f881d570d673673352675b SHA-1: 72d8419f47b26971604afbf1cb2151ae213c0a73 SHA-256: 9766ed519d05c71ba3690c36d2723ffbe31837b46c900444737999cc26148fd7
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with 28 external PDF links, including one pointing to 'sawuraba.weebly.com', suggesting an attempt to distribute further malicious content or engage in SEO manipulation for phishing. The document body, though partially corrupted, contains text related to 'Cumberland county tax bureau' and 'invoice/payment', aligning with a phishing lure. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=cumberland+county+tax+bureau PDF link annotation
    • https://sawuraba.weebly.com/uploads/1/3/4/7/134720576/gosesoji_lufivesimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5fdbc80336a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5faeffb848c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_5fc12f09324af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_5fb8a034f15e8.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/piradi/kakuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66fe517e72026400ff170/t/5fd0d1a32f29925fbb585ec2/1607520676940/slot_word_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/billing_statement_template_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/63721057641.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78c6658762305c0f93643/t/5fc9187ce4bb7d104797cec1/1607014525283/tiktok_mashup_august_2020_not_clean_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/16106588442.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/kegevixonesiko.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53b22bf71053ccb2c19db/t/5fd6a9a2481cfa31add3021a/1607903650897/81898224954.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/31616119683.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_off0000ba18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA18 5124 bytes
SHA-256: e4658f1ddf409e461ba2a9c4cad1a74686f8899b04f748cb68aa6f63382dc3cd
font_01_sfnt_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 10920 bytes
SHA-256: 68866e9d47927570ddf0753065b92942fd0f7eaeb48df864b5c1bfa715e86621

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