Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a579f8d2dab92…

MALICIOUS

PDF

65.8 KB Created: 2021-02-14 13:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4066689c6fd2d545d86bf507cacd65da SHA-1: 911350fe1f15f7779475504327b19ce874fcb71d SHA-256: 0c7a579f8d2dab92471616c33e379dae2ebf372356de9f1bc6299d5e8b86c706
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to benign-looking PDF files on S3 buckets, but one critical link points to a suspicious domain (jottigo.ru). This suggests a link farm or phishing lure. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful content.

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=great+scott+restaurant PDF link annotation
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/xaxiwobaguxi-deburuduvovokod-sowuwadirip.pdfIn PDF document text
    • http://vugijow.iblogger.org/88374924364.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/2749417b4.pdfIn PDF document text
    • http://pumba.fun/balatelitezolisojevmsna.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/tuxalowafokuvo/mar_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/7002404303.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/imeche_quarterly_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/tedumigik.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/xaguwadubuwipaza.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/44345365524.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/joxita.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/monopoly_game_board_template_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/hemostasis_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/annex_14_free.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_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 4792 bytes
SHA-256: a8be4b957f014a438b45df72a38537d17efbf59ce11aa39fa8326b1b8269f176
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 10484 bytes
SHA-256: 86eab88bd223e71eb7c64635a554b3ca8a5e02ccca2162b240f6f67794d5eea0

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