Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eca74f720fcfd73…

MALICIOUS

PDF

113.3 KB Created: 2021-03-24 03:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bef59912c6742c5309f7103b25ea734 SHA-1: 490a03cc655aef28b6e0a3c7556e302bcda8b401 SHA-256: 9eca74f720fcfd738c43d0e8d898b8f881a9254b6089abe6755141921019f4a1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent URL pointing to a site that appears to be part of a link farm or SEO manipulation scheme. The document body, though heavily obfuscated, suggests a lure related to 'Reiki pdf books in hindi'. No scripts were extracted, but the presence of numerous external links and the phishing detection strongly suggest a malicious intent to redirect users or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=reiki+pdf+books+in+hindi
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6015c52694aae.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_601f9ac9b06ed.pdf
    • http://vepapin.iblogger.org/free_browsers_for_windows_7.pdf
    • https://cdn-cms.f-static.net/uploads/4460946/normal_601a64add271c.pdf
    • http://pokezokebawi.mygamesonline.org/how_can_i_get_my_dog_spayed_or_neutered_for_free.pdf
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66de6c5333.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffbc6b08b54e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed4713ff-2419-41d7-acf7-4761d5e2b27b/tipos_de_sistemas_operativos_windows.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_5597a0d81c2c42a88cec5342b8825c1f.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_8d3ce986987040229d9965c95f7bc1b5.pdf?index=true
    • http://zakefuki.myartsonline.com/41185781866.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_390c0e7e92254fb0b3cd1fbe6977e30c.pdf?index=true
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_b4ddbdaf32794d948c7ca6f515c7aabc.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_6c7e300c28e64ed18ad7458f7f9bcd3a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2fdf46c4-ab22-4267-b056-5a3708f69926/warhammer_end_times_novels.pdf
    • https://uploads.strikinglycdn.com/files/faf30005-c10a-40d1-966a-d9edeb679898/alveolarization_phonological_process_examples.pdf
    • http://woloripovopakop.rf.gd/25412172281.pdf
    • http://bimogudi.rf.gd/rich_dad_poor_dad_ebook_download_epub.pdf
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_dc235f360ac6444dba230a46d099f06f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b51.bin
0db9713ada59e826d7c3f4494254131493c4719aa4eb5700ce63cb7a9c21342b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B51 5000 bytes
font_01_sfnt_off00018c5a.bin
c5ab2aab9fc8871dc6b85e31d74c8801f393da175173f24491bf1c67da97425a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C5A 13052 bytes

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