Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c06b0ce0c502bf…

MALICIOUS

PDF

78.8 KB Created: 2021-02-27 00:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03dd92a9c758bf5436798b4701e2fa7a SHA-1: c5306f1cd918a636ebfc304e5ca0cd006c56c6aa SHA-256: 11c06b0ce0c502bf75fdf43361915af4d28d30aeb37f3d793bf4285810aee67d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'link farm', suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/123?utm_term=what+does+str+mean+on+my+remote PDF link annotation
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/e49c40df96ce0b5.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/A4tNSjf/define_the_term_academic_performance.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/53679fb88fc14.pdfIn PDF document text
    • https://cdn.sqhk.co/goxoxasopus/hjjgcgf/super_adventure_rockman_english_patch.pdfIn PDF document text
    • http://bizuzagewad.iblogger.org/where_does_by_the_waters_of_babylon_take_place.pdfIn PDF document text
    • https://wusowekop.weebly.com/uploads/1/3/2/7/132741020/4286450.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/sesafefanulokam/32177003457.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/95126681267.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/what_is_the_titans_curse_aot.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/28366232743.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/celcus_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/article_370_in_telugu.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/is_hp_envy_4520_compatible_with_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/ncert_ki_full_form_kya_hai.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/juhayna_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/food_web_assignment.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_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5148 bytes
SHA-256: b49dca2577c282d42f01cbda56532838c5b6b741c356e288e6c2ac36f9b73d94
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10684 bytes
SHA-256: 58692cee9e4e0de6c13df221602168ab95ebcf69215d5f275282b9c08918a061

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