Malicious PDF — malware analysis report

Static analysis result for SHA-256 3762f4a395f45203…

MALICIOUS

PDF

69.3 KB Created: 2021-03-02 01:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 13892d06bb9ea59055bdc311a27f977f SHA-1: 29b95ca3a607f8f0b7414e7449415a816d1384d1 SHA-256: 3762f4a395f45203d057282b2af6608d305a115a2c93eab962967a2d188df662
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirectors. The document body contains obfuscated text and references to wkhtmltopdf, suggesting it was generated programmatically. The numerous embedded URLs point to disposable domains and link farms, indicating a phishing or scam attempt designed to redirect users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=the%20spectacular%20now%20trailer%20sub%20ita In PDF document text
    • http://razvivatel.blog/953716288070ir4a.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/2706748.pdfIn PDF document text
    • http://7lessons.site/ordinal_numbers_worksheets_for_grade_3f4e2s.pdfIn PDF document text
    • http://auto-agents.space/652663410262yb7l.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/calculadora_de_integrales_dobles_paso_a_paso_online.pdfIn PDF document text
    • http://table-wait.com/milady_chapter_31_review_questions_answersyakbv.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/jupenimawamudixabe.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/why_will_my_ps3_controller_not_charging.pdfIn PDF document text
    • https://sedesafatowezu.weebly.com/uploads/1/3/1/4/131437285/1288737.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/presto_pressure_canning_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5fd92a1bf0ea9.pdfIn PDF document text
    • http://espaceclient-cmb.com/collision_reporting_london_ontario1xypz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6017a9457cae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 5200 bytes
SHA-256: c8c3ebb5a461085d8c234e3f1815d43b1921f28b4d988e8a1fa684819406a724
font_01_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 10672 bytes
SHA-256: 75959b1c8390cc564d23cab819799019ad10e1add955a25bf79f264aad805143

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