Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7e02fb14991609…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 09:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dc10d17b07266da2f45bc4e7903d7d6 SHA-1: 5d61e1858913196e284df1de7707d518c6a78804 SHA-256: fe7e02fb14991609dbc339d18268f7b409602133e2102e6a60e540ad1c3ab8a1
196 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. It uses a LOLBin command-execution lure. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/wix?keyword=bulgarian+names+generator PDF link annotation
    • http://verifybadgesbusiness.com/guboweokyiw.pdfIn PDF document text
    • http://tosety.xyz/charlie_s_angels_full_throttle_soundtrackk0n9q.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/xiwasazafu/hgjcH23/51850638296.pdfIn PDF document text
    • http://stixlife.info/duganemobigukudekujuuh5f.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/gjaADyI/3d_modular_origami_chinese_dragon_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_789bd3ec7ead44cfa23864a22c909884.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/health_and_safety_course_online_ontario.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_65e0099202f4493295c40ba82ddf48fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/63846677507.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_68233fd29a2d47e1ba1878cf099de88d.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_45401546305e43bd81defdb30472497e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/dumbbell_bicep_curl_proper_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6799fcc6-cda1-4038-9218-dbccc6759570/30347666211.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_0506c410a95f48eca30977d569c7f9da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccbd1ff-15f7-491b-8c8f-c14bafe16c89/66994819040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913c9298-ed18-4da0-bee3-69fa5a0ddac9/64672662799.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/yuketen_maine_guide_boots_review.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_5e4ab1948f674c97a8ad1b459b09c189.pdf?index=trueIn 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
    • https://uploads.strikinglycdn.com/filesIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 5056 bytes
SHA-256: 6ff763a0440ac8d4d69a68619f9330581628675887db36c415a0b339af3ea097
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 12304 bytes
SHA-256: 787c20499d9f390005171ba9085d238f4e1f3cdbb1a0785ac83b6cd37626a5de

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