Malicious PDF — malware analysis report

Static analysis result for SHA-256 612bca79998c23ca…

MALICIOUS

PDF

66.1 KB Created: 2020-12-15 19:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14a266b102f1bea386043e4ee4554f8e SHA-1: e534500430dc39dc2d9c6c6ba6cb59e60fb4abd2 SHA-256: 612bca79998c23ca80ba86b69c99388a9766678d4e4b46e5fdc08d787ae26726
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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
  • 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://traffmen.ru/123?utm_term=short+story+with+figurative+language+5th+grade In PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/vilatixoli.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/e94fa7ce-80eb-43c8-be36-8051c0a31f2d/68961524130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f353274-13b2-44cc-9238-fea92d94d27f/big_bang_running_man_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/microsoft_excel_test_questions_and_answers_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452010bb-1c7d-4672-9c09-1fcee53707ea/ibclc_exam_2016.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc2b429e18c5c478e5466c6/1606595628840/52535889489.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/kajumoduzunafixadajuba.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/foranujenoketapif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b7e2cb-1d34-453a-9f7b-ce120f1c0127/reasoning_from_the_scriptures_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/2nd_declension_latin_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/dazujitevojudetetev.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/sky_sports_uk_tv_guide_for_today.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_off0000c3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BD 5652 bytes
SHA-256: c9a7eb313af86adc97104283f1c0724eee1bf19dcf6b44f3ab2400dabcce0deb
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 10656 bytes
SHA-256: bccd5c1bcf6b7a8156b0493b5ca5f36ce96c1090430e01045dd4efedf34384b7