Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b509af7cab57c6…

MALICIOUS

PDF

111.6 KB Created: 2021-03-24 06:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 11ad5db7aa64048df2082f4e1d115805 SHA-1: 4a05a2adb7b1b052e721a6aabb7010589e28e6da SHA-256: 65b509af7cab57c6c6c26371fa0bf39b8a9ea00ed8f4df22fd590095f472b51b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of external URIs and a link farm suggests an attempt to redirect the user to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended for callback phishing or a tech-support scam, aiming to trick users into revealing sensitive information or granting remote access. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/strik?utm_term=what+do+you+mean+by+too+big+to+fail PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496404/normal_602b5c5b1e055.pdfIn PDF document text
    • http://5-euro.info/sosenofifisorud6nxzo.pdfIn PDF document text
    • http://alisaborodaenko.design/woolworths_south_africa_swot_analysisie5oj.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/what_is_sustainable_development_in_your_own_words60nch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_600d84d3d8b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_5fd0ffa2db66d.pdfIn PDF document text
    • http://lanufutado.22web.org/83129705186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_60362cb84157c.pdfIn PDF document text
    • http://itmax.info/powershot_model_5700m_not_workingwpsir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_600cb7dc240e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_60438ddf371d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_602c3b94b9d2f.pdfIn PDF document text
    • http://medyahanem.com/oakes_respiratory_care_pocket_guide8k7mr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_605a9957ddca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_60330cfb3a73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_60143c4bd1786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_60276d88d40f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxekijonudi.epizy.com/69633459985.pdfIn PDF document text
    • http://rajokonola.epizy.com/jobofavibufixavupiramol.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_off000176d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D2 5300 bytes
SHA-256: c1c90e1462f2710a4a4ec35c212c9ce288cf654c69fe24231163053b729be6a3
font_01_sfnt_off000188d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D1 12168 bytes
SHA-256: 470d9eb6cb97793985e3d38949e1a4d91a197edf4bc17fcfb22eacc412a03f5d

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