Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc59c45c760efda…

MALICIOUS

PDF

70.0 KB Created: 2020-11-10 05:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d827fdb11edfef8d88ee5f9c349e6b6f SHA-1: d687afa84cf0102aa7e7081b81c2cce54153066c SHA-256: acc59c45c760efdae87924ad4bd714c846d996ee22d61ef9423a90de9b7f0fdb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?keyword=phone+apps+download PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/soxanudamun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8762cc18a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f872908447c9.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/xanebavifamopez/26716087009.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/numeros_romanos_ejercicios_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/functional_requirements_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/7691264947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9040a85e-065a-494e-8104-98135b770ec6/final_consonant_deletion_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81d1365-634d-48be-8c0b-9c86ae4f1b45/81094640923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9845b2-00e4-4a88-bab9-a3735cea7fb1/mexosatonofukawemonurisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f4ba39-cf6a-4706-9462-7860d9ee4379/74488796697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d32b2c-c763-4eaf-bdd8-994e221d391c/worksheet_works_cursive_writing.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 5044 bytes
SHA-256: b01582f24e33eb1753cbb2cd7c445f46b0579f964de00c7b9064c5f01aa5732c
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 10764 bytes
SHA-256: dbbcf8b2e5d8f11c30f33a2200a0d14b403799947214bcf2162ea9b7dd73ddbb

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