Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d6dee372309b28…

MALICIOUS

PDF

84.1 KB Created: 2021-04-28 06:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32b9b511ce2ae4dd03282345ae87a9de SHA-1: eb9a2f5e69bc2c946ec88938187feb84e8cfc037 SHA-256: 71d6dee372309b2864497a3c2eab9ddb4891cefdb3b86075d3c73c85a565d5a5
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 0.9997

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=singer+237+sewing+machine+service+manual PDF link annotation
    • https://cdn.sqhk.co/tajugajobib/giih4hg/fopunudojos.pdfIn PDF document text
    • http://copriyghtconfirmed.com/carnitina_subcutanea9edkl.pdfIn PDF document text
    • http://xovonakajo.22web.org/tuferosirajurenumav.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxuzoxu/jeicgfN/umconnect_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/lifeTjd/dejiwadigew.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/kadixugusofisotasawine.pdfIn PDF document text
    • http://shtangye.xyz/bleach_mobile_3d_quiz_answers11ter.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/xepijuzix.pdfIn PDF document text
    • http://tamizatej.22web.org/81766659364.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/edxjdhd/davutodobaxapusaxop.pdfIn PDF document text
    • http://migriruy.ru/567161746929ul79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejubegow.epizy.com/kanawimoxibumatexerafejug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b110bc77-07aa-49e1-a83b-0de30b541292/argumentative_essay_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc75fa9-da11-4a91-b0d1-acac50fd2f71/gasapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846a599e-d32f-4e51-9aa2-a16b2860656e/ford_mustang_ecoboost_premium_review.pdfIn PDF document text
    • http://lexubesupo.epizy.com/26965301200.pdfIn PDF document text
    • http://kenimobekefolu.epizy.com/lagewawigeki.pdfIn PDF document text
    • http://forarevepezifu.epizy.com/7128638615.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/how_to_thread_my_brother_lx2500_sewing_machine.pdfIn PDF document text
    • http://pokitudid.epizy.com/68135401200.pdfIn PDF document text
    • http://guneginumo.rf.gd/sedifopijusitenilipijuko.pdfIn PDF document text
    • http://poruroj.epizy.com/senodubirikubujine.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_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 5844 bytes
SHA-256: 99116fad7a00ab5b4941d3cb86c6eae70ece0b7018deeceb5c7a76e1ea865426
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 10744 bytes
SHA-256: f3434d830d30134ade71a24286b6ec7be42ae4f6d94449cf54dc878ddff3d6e3

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