Malicious PDF — malware analysis report

Static analysis result for SHA-256 b283e38eef13ed28…

MALICIOUS

PDF

72.2 KB Created: 2021-03-10 03:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 851268cba93c5eb30e2fac57b95e43e8 SHA-1: 3da1d09e8b983d1eb44f98affcef56edea519e9c SHA-256: b283e38eef13ed28913bdd9554f6e6f5229d02de8786de96483eeebdb3449d3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The document body, though heavily obfuscated, contains a URL related to 'buy bed sheets sale online', suggesting a lure for phishing or malware. ClamAV detection and ML classification strongly indicate malicious intent.

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://dugedepap.ru/123?utm_term=buy+bed+sheets+sale+online PDF link annotation
    • http://digitalliteracyinstitute.com/how_to_make_a_flamethrower_in_minecraft_command_blocke5992.pdfIn PDF document text
    • http://zizuvajutenuvun.22web.org/60139709597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5febc05e3fc30.pdfIn PDF document text
    • https://cdn.sqhk.co/bavozazav/CcigW8i/kufexelomi.pdfIn PDF document text
    • http://jujokifenake.22web.org/61979886618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_6007e03058265.pdfIn PDF document text
    • http://winoorama.site/what_does_catholicism_believe_about_salvationklje4.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/evLjhgf/xibom.pdfIn PDF document text
    • http://ozalupa.space/renal_threshold_for_glucoseyclog.pdfIn PDF document text
    • http://moluroniv.22web.org/colbert_report_best_moments.pdfIn PDF document text
    • http://dvestideyli.xyz/vafujexere0h7uf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456666/normal_5fefb81e25a46.pdfIn PDF document text
    • http://trackengine.host/how_to_become_a_certified_vet_tech_in_mississippiz7xwl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwapogajamafar.epizy.com/61461099011.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/sogaginidesuwev.pdfIn PDF document text
    • http://gebuzabode.epizy.com/33702746843.pdfIn PDF document text
    • http://wepesubotivirel.epizy.com/gregory_porter_real_good_hands_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/cullman_county_sheriff_arrest_reports.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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 5108 bytes
SHA-256: 3996ec000eca4bef46a889e324ba11ccb124b43d5edaf6a2abd651d454699f36
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 11184 bytes
SHA-256: 631ed003a2ad0674db380da5b938ff3cfe370dc7127167206ba73df21bf1c008

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