Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6ebc7ce60eef45…

MALICIOUS

PDF

66.7 KB Created: 2021-03-16 07:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5392bf8455f13ed5c96b1e9fe73ff11 SHA-1: 344aad8782608b29f5df44bdd6e5b1fc11a61df7 SHA-256: 3b6ebc7ce60eef455e1a2323739103d14abf69666c16f01cc9ae30bdec6c1480
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('midufefew.ru') that is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

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=dewalt+compound+mitre+saw+cordless PDF link annotation
    • http://tesidakikize.iblogger.org/baby_photo_frames_psd_free.pdfIn PDF document text
    • http://tokepefanoxite.22web.org/judujebinuvafanebasasuli.pdfIn PDF document text
    • http://zupejuxe.iblogger.org/wodabafozopeluvurilose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizagubiluxape.rf.gd/vabovuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/thickened_cream_nutritional_information.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_3fae37833ef448b4a0ccef61e34eba50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/mejivureved.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_fa85043f988344059fa566cc8a4ada6a.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_7d509810bd7a43fca9e19b5621f1cfd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/present_continuous_tense_questions_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6758d8-cc17-40c2-b313-fd41abb5a522/fuvibaropitekavetipeb.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/lagite.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/hp_probook_6550b_specs_i3.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/samefawaveniwatavix.pdfIn PDF document text
    • http://lamoren.rf.gd/fabigajiloruzobota.pdfIn PDF document text
    • http://sefibonep.rf.gd/slugterra_journey_to_the_eastern_caverns_in_hindi_download.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_a913daaef1de4a2fa9c59d5658b54258.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12e57cf-9368-4723-b9b1-fa596e85c58b/craftsman_lawn_mower_carburetor_diagram.pdfIn PDF document text
    • http://navezozewa.epizy.com/78874876049.pdfIn PDF document text
    • http://zibozepor.rf.gd/wedokoremimorede.pdfIn PDF document text
    • http://dojipezeka.epizy.com/63908272636.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 5308 bytes
SHA-256: 048be23e23708b15e86d27bfcc5308a6d4c126548be28404636260af905aa48b
font_01_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 10600 bytes
SHA-256: b96521d6fc6c2f630d7dde76885985299c8c138cceac1920c86438c7c9514414

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