Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e26f87a441ec141…

MALICIOUS

PDF

77.4 KB Created: 2021-02-05 06:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 025c2e9bf3c64a1db0d42ab6498f5a26 SHA-1: 32f06f3a11782f509c9bc33d1c98231247bae4ae SHA-256: 7e26f87a441ec141d4e2c63231a6eef8c84bffff5906e99bed3ffb2df7027a0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links implies an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

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/aws?utm_term=balance+sheet+average+accounts+receivable PDF link annotation
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/9273509.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/muvalegakiz-nimeki-vulotakebuzudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392867/normal_5fecd18a8f207.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/dthehhF/sliters_somers_hours.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/5691550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fcf7283a2c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5fe809c82cafa.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/gaxuremewuger/syllabication_worksheets_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/pharmacotherapy_casebook_10th_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/answer_love_yourself_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/23107774130.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/fts_test_answer_key_pet.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/information_booklet_neet_2019.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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5308 bytes
SHA-256: d816faee08722d9a3e204f2e911dc2912d8342091c016a154c3885e34e70e53b
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10988 bytes
SHA-256: db05348bd426cad9b1316d499b8fafeb3a8c94ff43bc9b2d7170f509c57a15a7

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