Malicious PDF — malware analysis report

Static analysis result for SHA-256 c581bd1a8edb90e9…

MALICIOUS

PDF

76.3 KB Created: 2020-12-22 02:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea541fa9a708a34ffa2e40f4d45c9404 SHA-1: 961903d759a332de069a4c9880d142f48d5a883b SHA-256: c581bd1a8edb90e917db2c7a410490d4534e147bb28fa971042c0b9ed6b83a51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other cloud storage services, suggesting a link farm or content distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for SEO manipulation or to host malicious payloads.

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://traffset.ru/aws?utm_term=complete+university+guide+2020+computer+science PDF link annotation
    • https://getugegifajit.weebly.com/uploads/1/3/4/4/134481189/pefeti-fejije-torisojik.pdfIn PDF document text
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/e0113de.pdfIn PDF document text
    • https://sufivelogazawe.weebly.com/uploads/1/3/4/6/134600369/worir.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/wozowuledij/argentinos_juniors_fc_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd44de8580e136cdf53fe3/t/5fddfc74892c8943b09fc35f/1608383604925/10._3_acquiring_new_lands_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/jailbreak_for_ios_12.1.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09ee66a-10e3-4cf1-b0a5-fe6d51370d12/tukenazi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/endgame_online_free_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/microsoft_access_student_database_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce322641ec4a2cc0e15080/t/5fd654a7481cfa31adc5a0c4/1607881896116/android_google_maps_cache_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/apple_video_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/burke_s_law_1994.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc779470d716e027b043af0/t/5fcfeb2be21d50615a5b12d2/1607461676689/black_panther_costume_kids.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d031084698658e80009c/t/5fc8cc74e101942bf77938af/1606995062235/56918379640.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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 5524 bytes
SHA-256: 512fb4cf072fccb2f7e84f771d6fa3af38b3abdd1d6e5e2123ca5bcb6597a814
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 10928 bytes
SHA-256: a132e360b0e877edbde3f34d963b422f74282a18299e32883ce1aad1291e5827

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