Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86969c28f3b5d39…

MALICIOUS

PDF

82.5 KB Created: 2021-03-12 18:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db15bd4a66bcfb590ff6eaacebccb437 SHA-1: 92eba8b54cf60f2bf8e3e85cc4e56f0555bf1d00 SHA-256: a86969c28f3b5d396cf1bb307bb2c22ed69da59863b0659a3c1dd9d79780629f
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://midufefew.ru/strik?utm_term=what+are+the+key+roles+of+the+president PDF link annotation
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/xetezududiju_dakugavisome.pdfIn PDF document text
    • http://gefupisagiv.iblogger.org/uptet_answer_key_2020_paper_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_6033e5ba9bcc5.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/kagapugedividab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_601e470ea6f42.pdfIn PDF document text
    • http://batezelokev.iblogger.org/negative_integers_word_problems_worksheets.pdfIn PDF document text
    • http://buzixivolerat.22web.org/inteligencia_emocional_en_las_escuelas.pdfIn PDF document text
    • http://rijafinawaxus.iblogger.org/hiv_guideline__2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fcf12d2e9900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6012762925c30.pdfIn PDF document text
    • https://toguvavi.weebly.com/uploads/1/3/1/3/131381044/nigofomamifikez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://rifavewo.epizy.com/the_heart_of_betrayal_english.pdfIn PDF document text
    • http://batefagut.epizy.com/falls_lake_bass_fishing_report_2018.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_df80ba388d2b4548993d2b72efd5d645.pdf?index=trueIn PDF document text
    • http://mepoketefetur.rf.gd/zaxelavawoxarumif.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_61d96ab76bdc40afb77c603d7857c502.pdf?index=trueIn PDF document text
    • http://zugulikusofa.rf.gd/8325362037.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 5308 bytes
SHA-256: 1c50d972e83201fc53a2abc2101bc3620c8bc95f3c0e1639408ab64c52e03c55
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 11128 bytes
SHA-256: 73272b25415a1a3c136ac1a5546c6927be0b38a9f8c1de0f82b8480ea018df23

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