Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0b41ffeeff376…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 01:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 222522a91a46a5c2bd30de7301f53f8a SHA-1: b0b28f6aec56c65d174016ec1ca797c5030df2fa SHA-256: 87c0b41ffeeff376bac419a59978fc4807a0fdb45cf83c63216ce33cd8a83b02
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 0.9998

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://soxebez.ru/award?keyword=basic+electrical+engineering+mcq+question+answer+pdf PDF link annotation
    • http://farotosinotom.mywebcommunity.org/diac_arbitration_proceedings_rules_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/jiaiFbb/luzino.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/bipolar_1_disorder_dsm_5.pdfIn PDF document text
    • http://fefujikaviw.22web.org/qualities_of_good_research_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/chcgf2m/nanopenovorab.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/hjciijg/85998454038.pdfIn PDF document text
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/90fb58.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/buxobafix-rikole-fepozale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab4bcae-9ba3-4e85-bb83-a7d9a9bc873a/what_equipment_do_i_need_for_crossfit.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/67870697392.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/98797082626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88e55f4-74d5-4a3c-affa-85f3bfa8293b/20439478161.pdfIn PDF document text
    • http://mojedebebetum.epizy.com/hot_wire_anemometry_principles_and_signal_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/rudemizulizorefifenunu.pdfIn PDF document text
    • http://ruxunuweni.epizy.com/ccs_university_ba_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/unimodal_bimodal_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/13975654315.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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 5744 bytes
SHA-256: e907b60d7f1c7e5a3135a979005da82674856f2b46a29cb468f52a8c964868c4
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 11048 bytes
SHA-256: 920fd46ddce18228b7f10f24725484aad2710e83ca4e4be9674ddf4f9b0fac15

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