Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b240f57c73f43e…

MALICIOUS

PDF

73.0 KB Created: 2021-06-13 06:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1339a739b98fdb4b9512179db81921ca SHA-1: c8e40b0b41b1b14d63e3b6e9011250b402e62ac9 SHA-256: 11b240f57c73f43e5e4a0df31db8b312f0e069e39a897557e2d4709945903486
96 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. It contains an embedded URL that leads to a download, likely a phishing lure disguised as a free ebook. The document body, though heavily obfuscated, contains text related to a download and the authoring application, suggesting a crafted lure. No scripts were extracted, but the presence of external URLs and the nature of the detection point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://synerhu.ru/pbw?utm_term=journey+of+souls+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426418/normal_6022bc6972f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_602e7c98e40e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5ff7f136d1586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fe9b4b3d0d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fd84f7e1e1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_5fe8176c483ff.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464869/normal_60b5ae1c4fe1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_60378772184c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422908/normal_5fecf449e4c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_6056051dee0cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffb370b8d5f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_60168a3451e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5ffe86fc4a087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_5ffd2b3329a87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/85ab1127-7822-42a0-8dc1-5c89288d69c0/hannah_arendt_un_estudio_sobre_la_banalidad_del_mal.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144634632/wesibazafenafopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9483f1e8-39c8-4b0f-9848-78fdbc83e2fb/can_you_cook_a_steak_on_a_cuisinart_griddler.pdfIn PDF document text
    • http://dokajawema.pbworks.com/f/vubevulugelovademowasofig.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144520542/43265897424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103ee55c-229e-404a-9437-8d6aaedf2e81/15635751235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0efe0c6f-6f37-4d34-82dc-71895fe18ef7/gagarodobilamogagupime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfd2a85-392b-4b49-8006-25d6a5494229/jobs_for_felons_in_tulsa_oklahoma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 4972 bytes
SHA-256: 72640cd2c43319af8ed8ba1c0232b9728cda17e3da8a577eceb430cd59ffd46f
font_01_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 10184 bytes
SHA-256: 9ec359f0d616c3acea3a0232a5c7635e1c45f217918bd8e7859d62531f5763fe
font_02_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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