Malicious PDF — malware analysis report

Static analysis result for SHA-256 9777cffb23269ebf…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ec2e643edee793028947a442257a269 SHA-1: 890f0a0fb6ded4a8cfeb0ae5f6c55362765d103c SHA-256: 9777cffb23269ebfa0bed933213b2c1b46a9b497efabb1a13cb29e3f8d760910
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=mechanics+of+composite+materials+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416326/normal_5fe5f1823bbfb.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/guvevukesulojasr2rq.pdfIn PDF document text
    • http://solent.bar/6636112188427dc1.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/N3iTWhd/93506258580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5fd781b23e4fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/jaigwmv/mini_golf_cartersville_ga.pdfIn PDF document text
    • http://slimerecipe.org/wufij3z65k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fcf78d12f267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475392/normal_5fefeaf0b37aa.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • http://saratov.ooo/data_structures_and_algorithms_udemy_freemerjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_603b29605b08c.pdfIn PDF document text
    • http://lnstagrambusiness.com/carrocerias_ganadeiras_molas1ruwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fd68afdbbcb3.pdfIn PDF document text
    • http://storezone.info/67522744066bjhq8.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/GicigUP/fiwaketenedubolulo.pdfIn PDF document text
    • http://espaceclient-cmb.com/digilunowelobojodafezuxir90jbq.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/eebe4e6d-ffff-4917-af18-1c175e0503f6/pusedel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa23fea-e790-4742-8a6a-50916651a024/pinamukivilejimi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 5400 bytes
SHA-256: b937afb5f51ac363d08e97815a7368fa3eda9262bf3bab2f0c10a62a9cf469d4
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10984 bytes
SHA-256: 94ac6ae570bdd644e412f38b09036f604d113d7494f0cc61f5a7169e0edfb1dc
font_02_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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