Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd7d270eb4ea14e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 13:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be02f6ca4aec5f4d444fab133f9458cf SHA-1: 76914c9a6a8e5b56f35d002107874a58c4051bef SHA-256: 6cd7d270eb4ea14effdef1a2171b8f5448f552d7502c370cc2932ef37de41275
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host phishing pages or distribute malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=south+carolina+service+commission
    • http://milafikolume.iblogger.org/bejivonum.pdf
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/0966503a1e7d50b.pdf
    • https://static.s123-cdn-static.com/uploads/4424009/normal_5fe4fbcda385f.pdf
    • https://cdn.sqhk.co/zuvaworizon/Yifrjan/nomisuza.pdf
    • http://bobutukaboxavaj.iblogger.org/46129737383.pdf
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5ff5ef81ca7a8.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_603f805cb5fd8.pdf
    • https://cdn.sqhk.co/morureju/Sgevhje/fadugoje.pdf
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/bebf867c.pdf
    • http://zatawonilar.iblogger.org/6566558060.pdf
    • http://lexibanoma.iblogger.org/common_application_form_barnet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kebanibaru.epizy.com/what_bones_are_formed_by_endochondral_ossification.pdf
    • https://uploads.strikinglycdn.com/files/d6b38db4-8714-4926-92f0-cdb0dc075ce9/naxeze.pdf
    • http://jurejoziralub.rf.gd/osaka_subway_route_map.pdf
    • https://uploads.strikinglycdn.com/files/6323ddb8-ffea-469f-bc8c-fe4de7b04690/87077562304.pdf
    • http://givemuzod.epizy.com/internet_browser_android_app_free.pdf
    • https://uploads.strikinglycdn.com/files/771592f3-ffd7-4af8-80fa-2b720a2de2be/56753905636.pdf
    • http://bokizimumizom.epizy.com/vibaxamudasabib.pdf
    • http://rebipilu.epizy.com/solucion_de_ecuaciones_de_primer_grado_online.pdf
    • https://uploads.strikinglycdn.com/files/2cbc1d37-c9fb-4e44-87fe-912b6347117f/vuwosiguf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ee.bin
67dc5f9c357d2cb9a8e26e09552b5659ab2b982856f670ab36df3f014df99728		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 5204 bytes
font_01_sfnt_off0001067d.bin
a491266b5143e31fcfb68806b30cb2ec8f1c40c727ba5a115683f5a1d98b3549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10836 bytes

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