Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5be6722e6cf458c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 20:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78299d7eb64de57170af8adb122372e9 SHA-1: 5d9c859d6a02f7611287459681b9b9aa43312853 SHA-256: a5be6722e6cf458ca7929fe132d52d6b49393cb045ff6337ac1df629e4333599
166 Risk Score

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. It uses a password-protected-archive lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/wix?keyword=mega+link+downloader+processing+mega+links PDF link annotation
    • http://gamedv.design/download_zippyshare_dreezy_big_dreezexejz.pdfIn PDF document text
    • http://bridgecommerce.com/meydan_larousse_ansiklopedisitbpc8.pdfIn PDF document text
    • http://biwepojulax.22web.org/what_are_the_36_questions_to_fall_in_love.pdfIn PDF document text
    • http://bigno.space/organizational_chart_template_with_pictures3zyjm.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/wadaribixapepura.pdfIn PDF document text
    • http://redatimiwanal.iblogger.org/70014086911.pdfIn PDF document text
    • http://dimoduves.22web.org/6702409796.pdfIn PDF document text
    • http://spindlndou.space/svt_6me_tableau_germination_lentill3yfxw.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/como_converter_para_autocad.pdfIn PDF document text
    • http://hookup755.fun/jalofivebuzuvopelugutafirpiwrd.pdfIn PDF document text
    • http://tryne.xyz/gestational_diabetes_management_guidelinesj8jht.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/taguchi_method_exampleuunvk.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/29307473927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/will_they_make_a_witcher_season_2.pdfIn PDF document text
    • http://tubupokus.rf.gd/74006113956.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/7740198804.pdfIn PDF document text
    • http://pubexet.rf.gd/bereken_bmi_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/wivizotopazetezezuzeb.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/30018547090.pdfIn PDF document text
    • http://givugiv.epizy.com/tripartite_guidelines_mom.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_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 5552 bytes
SHA-256: c17401c402d9cbaa0284aa865644bb6dbe6bdcf707e0b16055dc4fadd8a667b8
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10968 bytes
SHA-256: 2f9d34c8647364b6efd47790aade38dc8396f4b2964b558617bfda12db4d0433

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