Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aec2b1b957eb8d…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 23:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2b9bb433d14b8ec33f473e45f5576c7d SHA-1: 964528667f5cc8c0406f85bacd6f310ecff3ef73 SHA-256: 90aec2b1b957eb8d0efe61703491c9e9dcf00500e5abc258e5bfb76545bd3ac3
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which are disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external resources, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=2013+dodge+avenger+thermostat+housing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fe3025580d1c.pdfIn PDF document text
    • http://pusokum.66ghz.com/centos_6_dvd_iso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_5fe5da41e9715.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/4a5308d3c8d0f08.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/6198339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_600ea0cbf3cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_602540dae0601.pdfIn PDF document text
    • https://dupifexuxesopap.weebly.com/uploads/1/3/5/3/135348138/benedijugi.pdfIn PDF document text
    • https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/97617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601e70474cb93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5febff531ca32.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/b1520f623f1233.pdfIn PDF document text
    • https://rewiwuzaziba.weebly.com/uploads/1/3/5/9/135959403/d31c2a3b8924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_60068d94b9c3c.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/mawesenasijoser/printable_employee_of_the_month_certificate_template.pdfIn PDF document text
    • http://malakevuxe.epizy.com/krups_espresso_maker_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/27876705410.pdfIn PDF document text
    • http://gesonumakokobal.rf.gd/febrile_seizure_guidelines_2018.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_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 5660 bytes
SHA-256: 6d7f891c7237c9787cc47aba64feb54446e6e1f5d9ee31b01453716bbecdb5d1
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10656 bytes
SHA-256: 07a7fc94997ce3d67782e588df98c68aa85530188f2c4b4b61981bebdd0c4504

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